20m Delta Loop Antenna

I laid out the antenna wire on the lawn in back of my garage, with each side measuring 47. The yard behind my house has one 30' tall mast near the center, which can serve as the center support of a delta loop. I started out by building a full wave, square loop for 20 meters. I'm feeding it at a vertex with ladder line run into a autotuner. DELTA LOOP (50 Mhz) Con l'arrivo del TRX sui 50 Mhz si è presentato subito il problema di realizzare un'antenna semplice,poco ingombrante e soprattutto funzionale. 305 - Inverted Dipole Delta Loop Antenna for 40m,80m,160m. If tuned for 3. 99 K4TR FULL WAVE DELTA LOOP Another made to order classic antenna which is also a superb performer. I was getting reports with a difference of 2-3 S-units and so was my receive. 93 - Picnic Vertical Wire Antenna. Welcome to the G6OHM Website - Antenna Designs - Amateur Radio,Projects,Antenna Designs, Double Quad Beam,2m & 70cm SSB, Ham Satellites,Card Making, Recipes,BNOS,Flowerpot Antenna, Angela's Page,EXPMR Radio,Raised Bed Gardeningsion,Fusion Radio. An easy, inexpensive gain antenna that you can build for 20 meters. Use a rotator to turn your Delta Loop to cover all directions, as vertical loops are good at peaking and nulling signals. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. HF Vertical Whip Antenna Codan 406; HF Traveling Wave Dipole Antenna Codan TWD215/315/525; HF Delta Loop Antenna D230/330; HF Semi-Delta Antenna Codan SD214; HF Multi-Wire Broadband Dipole Antenna Codan 463; HF Broadband Multi-wire Dipole Antennas BBA-120, BBA-120E. On the other hand, I had reasonable SWR values without matchbox and with the preferred coaxial cable at my own delta loop.



40M Delta Loop fed at top apex with total wire size of 140 feet and 6 inches. This calculator enables you to test the design of an octagonal loop antenna and to answer "what if" questions until you arrive at a design that meets your needs without a lot of experience in electronics. G7FEK antenna: short 46ft/14m multiband 80-12m EF dipole Linear loaded dipoles. The yard behind my house has one 30' tall mast near the center, which can serve as the center support of a delta loop. Matching such an impedance and driving it with a feed line without excessive line loss presents another problem. I could horizontal but I then couldn't get high enough. You can feed the antenna with 50 ohm coaxial cable for single band use or connect the antenna to an antenna transmatch (i. 93 - Picnic Vertical Wire Antenna. 2 kinds of grease are supplied with your antenna: • Aluminum contact grease: Professional grease containing 30% aluminum particles, recommended for the assembly of aluminum antenna tubes. " 20m are very DX oriented. The most common material for home building small ham radio loop antennas is common copper plumbing pipe. a delta loop antenna that can be tuned all over hf bands with the help of a icom ah 4 external antenna tuner. The following is an article which I wrote and was published in the February 2013 edition of the Central Coast ARC "Smoke Signals" magazine. 02m Para 17m: 3. I wanted high efficiency 40 Meter antenna with low-angle radiation. 87 – Capacity Tuned Folded Loop Antenna for 20m. Hi, I have been using MMANA-GAL basic for a couple of months and designed a 2 element 40m delta loop. INCLUDED: a) Tripod b) 6:1 Vernier Reduction Drive, c) Outer Loop with continuous frequency coverage from 7 MHz to 29. The delta loop was built on the ground. Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees.



Relatively being a newbie when it comes to the HF universe, I had never tried my hand with the magic 20 meter delta loop. Noise and Loops. My main antenna is a full wave 40m delta loop which also matches well across 20m. User Responses to the Loop Skywire W8BO (40-meter Loop Skywire at 20 feet): "This antenna has to be the best-kept secret in the hambook! I had been using the loop vertical for three years when, one day, I worked an HA4 in Europe. They really can be fun to use! Get going on HF with EAntenna Multi-Band HF Delta Loop Antennas, available exclusively in North America from DX Engineering. 20 Meter Antennas. 200 with an SWR of 1:1. 305 - Inverted Dipole Delta Loop Antenna for 40m,80m,160m. Arduino Flex Switch Box. On the other hand, I had reasonable SWR values without matchbox and with the preferred coaxial cable at my own delta loop. It was built using 2 16’ crape poles and some aluminum electric fence wire and mounted on a PA speaker. It is roughly 475 feet long and fed with 450-ohm ladder line. The Sigma Euro-Comm DELTA- 15 HP. As well as the compact mobile HF loop, two versions of fixed station loop antennas are also available, which operate on both NVIS and long distance sky-wave propagation modes across 3-30MHz. The DX-Wire is very good - three times lighted than 3mm Kevlar core, but is very stiff - I don't like this because I think it is less resistant to wind flexing and metal fatigue. K4QKY two element parasitic delta loop array Ladder line fed loops perform well.



The antenna has only ~9 kg of weight, so one person can raise it without too much effort. There is a 4:1 balun at the feedpoint enabling it to be fed directly with 50 ohm Coax, RG-213 or Mini 8 is probably the best but other variations of coax may be used so long as they are of a. In part one of this series, I covered the use of one brand of commercially available, small transmitting loop antennas, also known as 'magnetic loops'. The loop is loaded by an adjustable capacitor (required value about 65pF), the coupling to the feedline is made through a small delta loop, matched with a 1/4 balun (200 ohms port to the bottom of the delta). • The antenna shall be supported from a single point at its center. 30 is a transitional band where vertical and horizontal antennas both do well for DXing. It is compared here to just a Loop as well as just a 6 or 4-Whisker Bowtie. Since I am also in that position I thought I would share what I do, perhaps it will help others with a simple solution to the problem. decided on a small magnetic loop antenna after researching the subject on the web and reading the following statement from VK5KLT's article on small magnetic loop antennas. One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. 20m loop antenna dimensions I had a 20m dipole at the back edge of the rear garden that had its feedline running to the deck on the rear of the house. This feature is not available right now. 22 Different Wire Antennas. Inverted Delta Loop. 5" untuk fishing rood dan u-clamp 2" untuk ke tiang Gambar diatas proses perakitan bracket menggunakan besi siku L, kebetulan nemu panjangnya hanya 125cm, saya bagi…. QUARTER WAVE 75 OHM COAX QUARTER WAVE MATCHING TRANSFORMER (Q SECTION) FOR LOOP ANTENNAS. co/UMDkJKXMKY https://t. A delta-loop antenna with ATU was described by WB8IMY and published in QST May 2002: One Stealthy Delta.



This calculator enables you to test the design of an octagonal loop antenna and to answer "what if" questions until you arrive at a design that meets your needs without a lot of experience in electronics. The delta loop, though, had a matching network to put it on 17m, and I neither wanted to give up 17 nor put up a separate antenna for it, so I decided to design a matching network. 20 Meter Antennas. A simple slit cut in the end cap allows the ladder line out and a dab of silicon glue or hot glue seals water intrusion. 81 - Inverted-L for 160m. 93 - Picnic Vertical Wire Antenna. Use a rotator to turn your Delta Loop to cover all directions, as vertical loops are good at peaking and nulling signals. •Need lots of room, keep them away from metal objects like heaters and ducts •Wire antennas can be run near the peak of the roof inside the attic, bent in odd shapes to match the space available. This makes it possible to remove the loop without de-soldering the PL259 connectors. Neyse, öyle ya da böyle her şekilde güzel antenlerdir ama genişçe bir alan veya bahçe ister. Dipole, Inverted V and Delta Loop are used for many bands with one variable – the length of the conductor. The antenna can have its apex either pointing up or down. In you're opinion which is the best wire antenna for 80, 40 and 20 meter ragchewing? I am using a homebrew G5RV. My main antenna is a full wave 40m delta loop which also matches well across 20m. My garage is 55 feet long about 35 feet wide.



We are also currently working on designs for Vertical Antennas, so check back with us for updates. The square has 0. Result, Summary The Loop Skywire, with a triangle shape called Delta Loop Antenna, is an easy to build multiband antenna, without the necessity of traps or coils, using just simple wire. "A properly designed and constructed small loop of nominal 1m diameter will outperform any antenna type except a tri-band beam on the 10m/15m/20m bands,. It covers the frequency range from 20 to 6m and is smaller. However, you may find that your mono band delta loop may tune up on it's second harmonic at a higher frequency eg. This in itself is very important as some stations lower than a 3 you would not even notice so on that point alone the Delta Loop is a winner. Performance is fine, I can work the US and into South America and Canada occasionally with a couple of contacts in Japan. 10-80 Meter Magnetic Alpha Loop Antenna handles 100W on 10-40M and 20W on 40/60/80 Meters when the included Booster Cable is installed. Hamspeak Delta loop — Name used to describe a full wave loop antenna configured in triangular shape. 55MHz, I anticipate having a good SWR on 80m, 40m, and 20m. The most common material for home building small ham radio loop antennas is common copper plumbing pipe. You can normally also expect the antenna to work on 28MHz (2x 14MHz) as well with a low SWR. My mainantenna for general use on 20m is my homebrew delta loop. 3 MHz, 7 MHz, 10 MHz and 14 MHz (18 MHz). Stress work, studies produce transfusions professor as and the said the organism. Humm…that and a spool of 12 gauge wire with alpha delta end insulators from the same junk box and I was in business. We will see that a vertically. It shall be easy to adjust (i.



Tecsun AN-200 AM/MW Rotatable Tuneable Loop Gain Radio Antenna(No Battery Needed) 3. • ALPHA DELTA MANUFACTURED ANTENNAS NOW MADE IN OUR IS0-9001 CERTIFIED PRODUCTION FACILITY. DELTA LOOP (50 Mhz) Con l'arrivo del TRX sui 50 Mhz si è presentato subito il problema di realizzare un'antenna semplice,poco ingombrante e soprattutto funzionale. My Loop Antenna November 20, 2013 9 Characteristics of Small Loop Antennas for HF Operation • Coupling loop ≈1/5 diameter of main loop for good impedance matching on all bands • Antenna is narrowband, operating at resonance of loop L and tuning C • Radiation resistance in series with loss res. 20m Delta Loop. The principle of the Multi-band Mono Delta Loop This ingeniously designed single wire loop antenna works in 4 amateur bands in a delta shaped configuration (hence I called it a multi-band mono delta loop). I have a glassed-in balcony on the 4th floor of an apartment block. The radio internal tuner will also tune the loop on 10, 12, 15, 17, and 20m. Delta Loop Antenna at 40m / 30m / 17m / 15m / 12m with the possibility to add the 20m band. In part one of this series, I covered the use of one brand of commercially available, small transmitting loop antennas, also known as 'magnetic loops'. Control Software* Firmware* Hardware and Pin Assignments* Remote Morse Key; Contact. Da una breve ricerca su Internet,sono riuscito a trovare il sito di Pete (PE1MHO) in cui viene descritta la realizzazione di una delta loop per i 6 mt,avente le caratteristiche di cui ero alla ricerca. 3 MHz, 7 MHz, 10 MHz and 14 MHz (18 MHz). The easiest antenna to make and put up seemed to be a full wave loop for 80 metres. 9 MHz Full-Wave Loop Antenna. At the heart of every radio and MLA (Magnetic Loop Antenna) is the resonant circuit. I wanted high efficiency 40 Meter antenna with low-angle radiation. 20m Delta Loop offset from metal mast - Felix Scerri VK4FUQ Benny is now a Silent Key. The idea is that this feedpoint is where the impedance on the antenna's fundamental resonant frequency is between 200-300 Ohms, so giving a low SWR when fed through a 4:1 or 6:1 balun.



Quad and Delta loop. 20m loop - 14. 6m Delta Loop Testing Connected to the Radio I was able to tune 12m, 15m, 17m, 20m, and 40m. Several members of the Nashua Area Radio Club recently got together to help one of our members, Ralph N1UH, put up a 40m Delta Loop antenna. This type of antenna has been used extensively for the last 4 years and has shown good performance when coupled with 100w from a Kenwood TS2000 radio. Recently introduced are the DBD range of antennas. Great article. , lunga 10 cm: DeltaLoop antenne, PA1HR This DeltaLoop antenna has a length of 125 meters, divided into three sides of 40, 42 and 43. If tuned for 3. Delta Loop antenna for HF 10/15/20 m (28/21/14 MHz) 5 kW. 10-80 Meter Magnetic Alpha Loop Antenna handles 100W on 10-40M and 20W on 40/60/80 Meters when the included Booster Cable is installed. Exclusive designs from some of the world's top antenna designers have been turned into professionally built, mechanically excellent antennas with a focus upon being manufactured the right way not the most cost effective way. Does not require an antenna tuner under normal circumstances (can operate on 12m & 15m with tuner asistance). The radio internal tuner will also tune the loop on 10, 12, 15, 17, and 20m. Introduction. The receiver can work with Long-Wire antenna, however an Active Loop Antenna with rotating mechanism performs better for 20M band. I had bought a 40m OCFD from them before which seemed to work fine, so decided to go for something a bit more expensive. Full Wave Loop Antenna Wire Antenna. Greases supplied 2 kinds of grease are supplied with your antenna: • Aluminum contact grease: Professional grease containing 30% aluminum particles, recommended for the assembly of aluminum antenna tubes.



High Performance 40 Meters Vertical. 30m loop - 10. 126 - Cobra Antenna for 80m. INCLUDED: a) Tripod b) 6:1 Vernier Reduction Drive, c) Outer Loop with continuous frequency coverage from 7 MHz to 29. I use this antenna and the 20m. or contact me on. 78 - Fan Dipole Antenna for 80m to 6m. 5 mm copper wire with black plastic jacket. 6m Delta Loop Testing Connected to the Radio I was able to tune 12m, 15m, 17m, 20m, and 40m. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. Result, Summary The Loop Skywire, with a triangle shape called Delta Loop Antenna, is an easy to build multiband antenna, without the necessity of traps or coils, using just simple wire. 0 using a 1:1 balun ( strange enough since most of the articles i read about delta loops required a 4:1 balun). The G4ILO Wonder Loop is an inexpensive, easy to make magnetic loop antenna that covers five HF bands, 40m through 15m. Operation from 500khz to 30Mhz. For one thing, my shack is on the second floor (the room with the windows next to the umbrella in the picture below), and this height makes it a bit hard to install a really good station-level RF ground. This feature is not available right now. The Sigma Euro-Comm DELTA- 15 HP. DX-A - 160-80-40 Meter 1/4-wave Twin Sloper - A top low frequency DX antenna. Ni4L Antennas & Electronics, Ham Radio Antenna, Amateur Radio Antennas, Shop with confidence, Amateur Radio, Homebrew Antennas, Ni4L Delta Loop Full-Wave $119. However, in several auto ATU manuals one antenna kept being mentioned: the loop (often a delta loop).



Inverted Delta Loop. "A properly designed and constructed small loop of nominal 1m diameter will outperform any antenna type except a tri-band beam on the 10m/15m/20m bands,. 76 - Half Rhombic Unidirectional Vertical for 20m to 6m. I have a 40m Delta loop I used to use at my old house. Use 75 or 50 ohm cable to feed the centre of the dipole. It is designed for portability, and can be assembled or disassembled in about a minute. delta loop Use at least 32-64 shallow buried radials, 20 meters long Major factors affecting vertical antenna performance: nearby towers over 12 meters high will degrade performance at least 32-64 shallow buried radials, 20 meters long, makes the difference between an excellent antenna and a poor antenna High performance receiving antennas. Multi-band with antenna Vertical can be a square, circle, triangle (delta loop) or. Half Delta Loop Antenna. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. I’ve been operating a Delta Loop antenna as illustrated (see attachment) for over two years with very good success. i spent the whole day to finish & tuned this antenna well. Progettazione e Costruzione - Vol. Dean: How about a vertical loop sup-ported by your tree? That’s when the sweatsock-filled-with-nickels-of-inspiration struck me upside the head. On the other hand, I had reasonable SWR values without matchbox and with the preferred coaxial cable at my own delta loop. We will see that a vertically. 89 - Indoor Loop Antenna for 80m. It is tunable from 1. 3/4 Wave Delta Loop (With added modification for 360 degree coverage) by KL7JR.



80 - Inverted Delta Loop Antenna for 160m. DELTA LOOP PORTABLE SE PUEDE GIRAR A MANO DESDES EL MASTIL Para 20m: 5. HIGH POWER Multi band Magnetic Loop Antenna 17-20-30-40-60 Mts. Control Software* Firmware* Hardware and Pin Assignments* Remote Morse Key; Contact. I'm feeding it at a vertex with ladder line run into a autotuner. THE DELTA LOOP IS A MONOBAND ANTENNA. Introduction. Like a capacitor's relative permittivity, a coil's relative permeability depends on the operating frequency, and the temperature, pressure, and humidity of the dielectric ( = "air" for a loop antenna)!. 127 - Log-Periodic Wire Antenna for 20m. Thanks to the designer, GM3AXX. And since there is only one variable-reactance element in the tuning circuit, the antenna can use automatic loop tuner software to keep the antenna resonant as I chase up and down the band during a contest. For me it's perform good for 20metre and 40metre. I'm not sharing the loop with another antenna farm on a switch etc etc. Continuous loaded vertical antenna. Best results are for 20, 15 and 10m band but (with an ATU) its worth exploring other bands with this simple antenna. LNR Precision's newest antenna market entry is the phenomenal new LOOP antenna designed by a degreed engineer. The multiband Delta Loop antenna by SmarTech consists of 7 elements placed on a single boom: 2 elements for 20 m, 2 elements for 15 m and 3 elements for 10 m in reflector-radiator and reflector-radiator-director configuration. My mainantenna for general use on 20m is my homebrew delta loop.



net home - Several years ago I was building a 20M delta loop (3 sided), See "Practical Wire Antennas," by John D. After a week I decided to feed it from the corner. It is fed with 70-80 meters of RG-218. We are a company in constant development and growth. Walter's now-classic volume on Traveling Wave Antennas devotes only a few pages. Its inspirations were derived from HCJB and W6SAI in his book All About Cubical Quads. My mainantenna for general use on 20m is my homebrew delta loop. pdf Easy to build Delta loop for 27 luuuppi. The antenna has only ~9 kg of weight, so one person can raise it without too much effort. Da una breve ricerca su Internet,sono riuscito a trovare il sito di Pete (PE1MHO) in cui viene descritta la realizzazione di una delta loop per i 6 mt,avente le caratteristiche di cui ero alla ricerca. I feel I haven't finished with loop antennas, I've built a 20m delta but I fancy having ago building some sort of loop for 30 meters one of my favourite bands. Recently introduced are the DBD range of antennas. In addition, there was a 80m CW station and (lower photo) a 20m Delta loop and 40m dipole in operation. Makes it an ideal antenna for fixed or portable. Humm…that and a spool of 12 gauge wire with alpha delta end insulators from the same junk box and I was in business. In the handbook the specifications for this antenna indicated it would' work on all of the bands above 80 metres also, that is 40 - 30 - 20 –17 - 15 - 12 and 10 metres. 119 - Wire Superbeam Antenna for 10m, 15m, 20m. Great Quality Affortable End Fed, Delta Loop & Windom (OCFD) Multiband Antennas.



I was pleased with the results but you do need a tall tree to hoist it up. My latest example is. As a result, these antennas are most often used as receive antennas, where impedance mismatch loss can be tolerated. net Article: H5ANX Mk4 Delta Loop Design - An effective and efficient antenna using simple materials - eHam. 11m Antenna Building Instructions on the Internet. There are only a few theoretical things we need to know about dipoles. It is tunable from 1. 55MHz, I anticipate having a good SWR on 80m, 40m, and 20m. Vertical delta loop for 20m Today I climbed up the trees and installed a delta loop for 20m, which at least in theory should be a good antenna also on the 10m band. The system is optimized in order to make the maximum gain ratio of forward and front / back, for each. Makes it an ideal antenna for fixed or portable. Use a rotator to turn your Delta Loop to cover all directions, as vertical loops are good at peaking and nulling signals. You can normally also expect the antenna to work on 28MHz (2x 14MHz) as well with a low SWR. 88 - Indoor Loop Antenna for 80m to 30m. Operation from 500khz to 30Mhz. Below is one example of how to mount a 20 metre delta loop on a small suburban house. The idea is that this feedpoint is where the impedance on the antenna's fundamental resonant frequency is between 200-300 Ohms, so giving a low SWR when fed through a 4:1 or 6:1 balun. The Delta range of antennas, which are full wave loops, are proving popular. Well due to power lines that run through my back yard I wouldn't be able to fit the 40m.



But we have seen about wire antennas that other forms can be used according to the same basic principles. This antenna needs a 4:1 Balun. Antenna for deed restricted lots An effective 10-20m DX antenna for deed restricted lots, original article by K7ZB Portable Loop Antenna. At the lower right hand corner of the loop, attached the 450 ohm ladder line. 126 - Cobra Antenna for 80m. with the Delta Loop as It sat back to 0 on the meter. Note the low angle of radiation. Over the coming months I will be doing checks on tx/rx on other bands as I do have a very good antenna tuner, also I may make one in the future for 20m. 7 elements full size arranged on a single boom, divided into 2 parts for 20 m, 2 elements for 15m and 3 elements for 10m in spotlight radiator configuration and reflector-radiator-director. One of the best kept secrets of Amateur radio antennas are either the box, or delta loop antennas. 200 with an SWR of 1:1. "tuner") with balanced feeders for multiband HF operation. This DeltaLoop antenna has a length of 125 meters, divided into three sides of 40, 42 and 43 meters. 75 - 160m Inverted Delta Loop. Since I am also in that position I thought I would share what I do, perhaps it will help others with a simple solution to the problem. 2 meters 6 meters 6m 10 meters 20 meters 20m 70 cm 440 antenna aprs arrl Azalea Coast Amateur Radio Club bracket building CW delta loop dipole Dodge Nitro dual band electronics field day FT-950 general gps ham radio HF HT IC-746Pro ICOM Kenwood Kenwood TM-V71A KK4EQM MFJ mobile power supply project QSO radio repeaters TM-V71A tube UHF usb VHF yaesu. Operation from 500khz to 30Mhz. 74 - Collinear Array Antenna for 40m, 30m, 20m. 305 - Inverted Dipole Delta Loop Antenna for 40m,80m,160m.



The DELTA-40HP is a full wave loop designed to operate on 40m (7MHz), 20m (14MHz), 15m (21MHz) and 10m (28MHz) without an ATU and other bands with an ATU. 35 MHz) Dipole, Inverted V and Delta Loop. • The antenna must be durable and secure. 93 - Picnic Vertical Wire Antenna. I'd like to put up an 80m delta loop. 11m Antenna Building Instructions on the Internet. The antenna is manufactured from lightweight but extremely strong construction grade 6082-T6 Aluminium stock with a heavy duty boom which is guaranteed to give you many years of excellent service. Despite its 3. I have constructed a 20 meter wire beam on top of my garage. 99 K4TR FULL WAVE DELTA LOOP Another made to order classic antenna which is also a superb performer. 975) although this generally does not make a noticeable difference in the antenna performance. to support malaria in in of redistribution Mahadevan. My Loop Antenna November 20, 2013 9 Characteristics of Small Loop Antennas for HF Operation • Coupling loop ≈1/5 diameter of main loop for good impedance matching on all bands • Antenna is narrowband, operating at resonance of loop L and tuning C • Radiation resistance in series with loss res. 350 mhz Made from copper wire. THE DELTA LOOP IS A MONOBAND ANTENNA.



Antenna Theory Loop - Learn Antenna Theory in simple and easy steps starting from basic to advanced concepts with examples including Fundamentals, Basic Parameters, Parameters, Near and Far Fields, Radiation Pattern, Isotropic Radiation, Beam and Polarization, Beam Width, Reciprocity, Poynting Vector, Types of Antennas, Wire, Half-Wave Dipole, Half-Wave Folded Dipole, Full-Wave Dipole, Short. And since there is only one variable-reactance element in the tuning circuit, the antenna can use automatic loop tuner software to keep the antenna resonant as I chase up and down the band during a contest. 124 - Terminated Folded Dipole for 80m, 40m. Berikut antenna delta loop mono band homebrew yang baru saja selesai saya buat. Vertical Dipole Portable Base Mobile Alpha Magnetic Loop antennas. I plan to corner feed it next time as it will offer a low take off angle which is better for DX. 8m by side, so 20m of cable are required. The transceiver is an Icom 7300 which tunes SWR 3:1 or less. 20m Delta Loop; Older Unsupported Projects. 87 - Capacity Tuned Folded Loop Antenna for 20m. You are looking at a AG6IF Talented Balun HP (Higher Power). UHF Shorted Bowtie Loop (SBL) Antenna analyzed using 4nec2. 92 - V-Beam Antenna for 15m. My SWR testing on the second harmonics showed RF and SWR needles swinging up and down together which usually isn't a good indication of an efficient antenna. Continuous loaded vertical antenna. The first step was to take the 14MHz Moxon model and run it on 18. 89 - Indoor Loop Antenna for 80m. Thanks to the designer, GM3AXX. All antenna is built in aluminum and stainless steel and withstand winds up to 120 km/h. 20m Delta Loop Antenna.