The goal, One Antenna, 10 Bands, 10 - 12 - 15 - 17 - 20 - 30 - 40 - 60 - 80 - 160 Meter.
Upon initial testing, very good results.
A Stealthy HF Coat Hanger Antenna
No, this is not about some cute antenna that's about the size of an oatmeal box and runs at 100% efficiency from 160 all the way up to 10 meters (and 6 meters if you leave the oats). In fact, there's nothing new on this page. It's just about a very common HF antenna that I recently built.
First an eyes check. Do you see an antenna in this picture?
9 band vertical HF antenna
Simple vertical radiator with a not so simple matching box. No traps, no tuner required.
A six-band, HF Windom antenna
This Windom antenna was marketed in the late 70's and early 80's as Smithe's Windom.
It was designed to cover 80, 40, 20 15, and 10 meters. By serendipity, it also covers the 17
and 2 meter bands.
THE HENTENNA
The Hentenna was developed by Japanese 6 Meter Hams, JE1DEU / JH1FCZ/ JH1YST in the 1970's and can be designed and built for hf thru uhf and possibly beyond! Sizes given are for 6m.
After much experimentation, finally, the antenna was developed with good performance, however, it was difficult to explain why the performance was so good, or how it is worked basically at that time. So it was named Hentenna, "Hen" means "strange" in Japanese.
The antenna has good performance and many advantages and it has become very popular in Japan. Many JA stations make it and enjoy it at home or in the field. Some Japanese 6m beacon stations are using the Hentenna antenna.
10-80m MOBILE HF MULTIBAND ANTENNA PROJECT
This is a combination center and top loaded multiband antenna. It gets a good boost in efficiency from the
capacity hat which, unlike the commercial bugcatcher antennas, is located where it should be: as high as
practical on the whip. The low profile of the capacity hat lets it cut through the wind while still remaining
effective. This is the largest diameter hat which can withstand highway speeds without using a stiffer whip.
Band switching is accomplished by moving the jumper plug to different tap points on the coil. You have
to stop, get out, and manually change the tap.
The GRASSWIRE another approach to hidden HF antennas
Deed restrictions got you down? Neighbors intimidating your tower plans? Need a really easy portable HF antenna? Then the grasswire may be the answer! Virtually invisible, lightweight, and compact (you can carry one in your hip pocket), this antenna works! It has been used by K3MT in various installations for more than 10 years.
Read on - and listen to the "experts" telling you that this is hogwash, that an antenna like this can't work. But it does. And true experts, who have taken a decade or more to come to grips with the intricasies of Maxwell's Math, know why it works.
160-10M Sturba Curtain
This design will work all bands from Top Band to 10M using a tuner.
Loop Antenna Dimensions
The purpose of the calculator is to give you a quick overview of the feasibility of "squeezing" a loop into your available yard or apartment space. The calculator yields a reasonable approximation of dimensions, to within 5% over the amateur bands, using typical wire gauges ranging from #12-18 AWG. (It does not calculate inductance, impedance, or even "Q" factor values since it is assumed that tuning will be accomplished using open feeds and a transmatching device, which should more than adequately compensate for the range of construction and materials variations as measured by these parameters.)
THE DOUBLE BAZOOKA ANTENNA
The Double Bazooka Dipole is a very efficient single band antenna which is very quiet and does not require the use of a balun. This antenna consists of coax (RG58) or other 50 ohm type with the shield split at the center and the feedline attached to the open ends.
Quickie Vertical KQ6RH
Here I am sitting in front of the rig listening to everyone working CQ World Wide, and I don't really have time for this, but I hear a few interesting stations on 20 meters and try to call them. Trying to bust the pile up with 100 watts and my hustler dipole is going to be difficult on this band, so I tune up on 15 meters and there is action, and I have a good wire beam, so I tune up and down the band and can't find a clear frequency. Then I hear some one say that 10 meters is open. So I tune up there, and there is a world of DX coming in. I choose a few interesting ones to call, but can't be heard. I should have expected that, as my antenna for this band leaves much to be desired.
I start thinking about a better vertical....
VHF / UHF Direct Connect Beams
Sizing details for several 2 to 4 element beams from 10m to 70cm
Phil Salas AD5X 40 through 6 meter HF Portable Antenna
Simplified and improved design from that published in the July 2002 QST. Now an aluminium tube design which is lighter and more compact tan the original.
Eight Bands On One Coax - The Windom Antenna
Requirements for my new antenna were simple: It had to have as many bands as possible on one coax. It had to be something I could BUILD myself (even though I'm getting really lazy in my old age, I still can't force myself to BUY a wire antenna - if I get to the point where the only option left is to buy wires from Gordon West, then I think it's time to hang up ham radio forever). It had to fit in my back yard (140 feet wide at the widest point and full of nasty short scrub oak trees).
FULL WAVE LOOP ANTENNA
Are you looking for an inexpensive wire antenna that makes possible HF operation on all bands 10M through to 80M with wide bandwidth? This Delta Loop is a threesided antenna suspended high in the air by vertical supports such as tall evergreen trees. Recommended height is 40 feet or more at highest point but higher is better. It's one feed line eliminates the need for multiple antennas to cover the HF bands.
Skywire Loop Antenna
In we ham radio operators' continual quest for the perfect antenna system, we try some strange things at times, but often, the simplest is also the best. That is certainly the case with the basic "loop" antenna, an often misunderstood critter, but one that gives absolutely the most for each foot of wire of any antenna I have had occasion to play with.
First, let me reassure you that such an antenna does not necessarily take much room. One reason I went to one in the first place is because I didn't have room for a 260-foot-long dipole for 160 and I wanted to give the "top band" a try for the first time in my 45 years of being a ham. If you are talking 75 meters (and up if you want a multi-band antenna...more later on that), it's only about 65 feet on a side in a square arrangement
THE $4 SPECIAL by Joe Tyburczy W1GFH
Now at this point, some of you may be looking at the diagram and muttering, "Jeez Joe, that's just a dipole fed with twinlead and used with a tuner". Well of course it is. Virtually all antennas are "di-poles" (i.e. "two sides") in some form or another. This one just happens to be made from low-cost materials.
I won't go into the theory here, but trust me: balanced feedline, properly used, does not "leak" RF and is less lossy than coax. I've tried the commercial 450-ohm ladder line, but prefer 300-ohm TV twinlead, and the cheaper the better. Radio Shack TV twinlead is ideal. Home Depot has some good stuff, too. Forget all the obsessive junk about standing waves, impedance and velocity factor. What you really need to concentrate on is getting an interesting set of antenna insulators.
EI7BA Multiband Cubical Quad
It covers six bands 20m to 10m on HF and also 6m. It is a Boomless (spider quad gem quad) design. It uses Glassfibre arms (a must). It uses a single coax line to a homebrew antenna switch. From there a seperate feedline goes to each of the Driven Element feedpoints. There is a homebrew Choke Balun at each feedpoint.
Performance
I have no accurate method to measure forward gain but I reckon it is the text book 6 to 7 db. F/B ratio is consistently 5 to 6 S points on my TS850 S meter on all bands 20 - 10m. I don't know how many dBs per S Point for my TS 850 but it is surely at least 3dB per S Point. So this translates to a minimum of 15 dB and arguably as high as 30dB. As with all 2 element Quads It has a wide beamwidth about 60 degrees.
ADDENDUM.. An extra two bands..!
I have added three elements for 6m and 2 elements for the European 4m (70mHz) band to the existing spider, and on a seperate 6ft boom which is clamped to the spider, I have 5 elements for 2m, and 9 elements for 70cms.. A grand total of 11 bands..
Australian Broadband Dipole 2MHz o 30MHz with no ATU
The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands with the exception of the lowest part of 80m. On 75m, we are feeding the antenna with a half-wavelength of ladder-line. On 40m, we are feeding it with 3/4 wavelength of ladder-line.
W2IK's IK-STIC 2
The IK-STIC 2 is a vertical, all band, antenna that is over 25 feet tall yet weighs under 5 pounds ! Using a tuner it can easily cover the amateur radio HF bands from 40 - 10 Meters. No unsightly wires as the radiating wire is inside the telescoping mast!
An effective 10-20m DX antenna for deed restricted lots…
The simple 15′ vertical antenna shown mounted on the railing of our second floor deck has produced almost 200 countries worked around the world… VQ9’s in Chagos and 3B8’s on Mauritius in the Indian Ocean, TX0DX on Chesterfield Reef, VK0MM on Macquarie Island in the Antarctic region, BQ9P on Pratas Island off Taiwan, ZM7ZB on Chatham Island in the South Pacific along with FO0AAA on Clipperton, 9M0OO on Spratly Island in the South China Sea, JT1CO in Mongolia and on and on. What I hear, I can usually work with this little wonder and the small size and profile make it feasible for use in deed restricted neighborhoods.
6-Band HF Center-Loaded Off-Center-Fed Dipole
The goal that I set out was to design an HF antenna, with a VSWR of 3:1 or less over the full bandwidth of as many amateur radio HF bands as possible, with a preference for the low- and the non-WARC bands. This design goal has been achived with a new kind of antenna;
St. Louis Vertical
The St. Louis Vertical (SLV) About 51' of twinlead is coiled on the 4' bottom section of a 20 collapsible fiberglass fishing pole. An additional 16' of twinlead in the clear serves as a vertical radiator.
Offers portable enthusiasts an easytobuild easytouse antenna which covers 1040M via a balanced line tuner and installs independently of external supports (trees are not required)
The $4 Special Antenna
Sure, you can find "all-band wire antennas" for sale in the back pages of Ham magazines costing $150 or more. But beware: Marconi spins in his grave every time a ham buys an aerial instead of building it. The plain and simple truth is that wire antennas for the HF bands were intended to be hand-made and not store-bought.
Untold generations of intrepid Radio Hams have fashioned their own equipment out of spit and bailing wire. Do you think the spark-gap dudes of the 1920's just went out and bought ready-built G5RV's from HRO or AES? No way! They slapped together aerials out of bedsprings, chewing gum, and frozen cow poop. For them, every day was Field Day. I think that home-built antennas should be awarded 10 db of "honorary gain" simply by virtue of their ingenuity. And in this world of microprocessor controlled micro-rigs, constructing one may be your only chance to build something and actually see it work on the air. Think about it.
BUILD THIS MULTIBAND FAN DIPOLE FOR ALL BAND HF ANTENNA EXCITEMENT
The only construction effort necessary over a standard multi-band dipole is the fabrication of a feed block or center insulator that is about 12 inches vertically by 3 inches wide, made of a good insulating material, such as Lucite, Bakelite, fiberglass, or PVC.
Mike Villard's Magic Anti-Jamming antenna for shortwave reception
Here's a neat little antenna for receiving on shortwave - that is, HF - frequencies. It's the brainchild of Mike (aka Dr. O. G.) Villard, Professor Emeritus of Stanford, founding father of SRI Inc, and one of the most wonderful colleagues with which it has been my sheer pleasure to be associated.
K3MT presents . . . The Quad and The ModQuad
Here's some thoughts on a "hardware-store special" 2-meter quad, and a modified quad for 2 or 10 meters. You can convert these to other frequencies simply by scaleing all dimensions according to wavelength. That is, to put the 10-meter modquad on 15 meters, just multiply all dimensions by 29.0 / 21.25.
3 HALF WAVE LENGTH HORIZONTAL VEE
The short vee beam described has a reasonable omnidirectional pattern with a maximum directivity in a line that bisects the angle between the legs. Good low-angle radiation is obtained when a horizontal antenna has a one wavelength height above ground. Below .5 wavelengths give marginal performance. For lower heights (.5 wavelengths and less), some improvement in low angle propagation can be had by tilting the leg ends below the center feed point. This will help improve DX but at the expense of the omni pattern not being as good and will increase the vertical pattern more skyward at a higher angle.
QRP Fan Dipole
The object of the exercise was to produce an aerial that would allow me to operate from 40 metres to 10 metres specifically 40 20 17 15 & 10 metres. The antenna was always going to be mounted in the attic as no external antennas are permitted at my QTH the attic allows the antenna to 'beam' roughly northwest / southeast and the house is some 40 feet above sea level. Construction would be simplified by the fact that I intended to run a maximum of 10 watts which means that the antenna wires can be simply attached to the rafters.
A Pyramidal Antenna for 14-30 MHz
It looks and works in much the same way that a standard lp antenna works, with one big difference: the two halves of the transmission line are separated and positioned as a V, so each half of the transmission line is in effect a single wire transmission line. Despite the fact that the two halves are separated, radiation from the transmission lines is negligible, contributing a small cross-polarization component to the pattern.
G5RV Multi-Band Antenna by Louis Varney,
THE G5RV ANTENNA, with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3.5 to 28mhz, specifically designed with dimensions which allow it to be installed in gardens which accommodate a reasonably-straight run of about 102ft (31.1m) for the "flat-top". However, because the most useful radiation from a horizontal or inverted-V resonant antenna takes place from the center two-thirds of its total length, up to one-sixth of this total length at each end of the antenna may be dropped vertically, semi-vertically, or bent at some convenient angle to the main body of the antenna without significant loss of effective radiation efficiency.
The LA1IC COAX-FED SLOPING LONGWIRE
Simple, inexpensive and easy to erect, this antenna provides directivity, low angle radiation and
a small gain on a number of HF bands.
Primarily designed as a point-to-point DX-radiator for 10, 12 and 15M, this antenna also does a fair job on 17, 20 and 30M. Its total length of 41 meters
MULTIBAND ONE ELEMENT VEE BEAM BY LA0HV
The TriDouble dipole has two elements of 3/4 wavelength each.
It has resonance at the design freq but the impedance is high (500 Ohm) and the reactance/inductance value changes greatly when you change frequency.
To compensate for this you shorten the element length a bit and add open wire, 400-600 Ohm (not critical). This will decrease impedance to 200 Ohm at the design frequency. This is why I use a 4:1 Current balun (must be a current balun).
IK-STIC by W2IK
The IK-STIC is essentially a multi-band vertical dipole antenna which is used in the field for quick set-up and quick band change. Since operation on each band requires antennas of different lengths, I devised a quick method of modifying the length to suit the band you choose to operate. There are no coils or traps. Each dipole band gives 100% radiation, thereby allowing maximum signal at maximum height.
3 4 and 5 Element yagi designs for the 10m 12m 15m 17m and 20m Bands
Monoband 3 to 5 elelment yagi designs
THE LATTIN 5 BAND ANTENNA
This antenna should be considered EXPERIMENTAL! Most builders who have attempted to build it, report difficulties! More research by builders is needed on it's proper design!
The antenna was named for W4JRW who invented it and holds a patent on the basic principle and uses quarter wave stubs, which act as insulators at the frequency for which they are cut. For example, the 6'11" stub (quarter wave times the velocity factor 0.8 of the feed line used) blocks RF for 28 mhz from reaching the rest of the antenna.
Feeding a G5RV
The essence of a G5RV is a dipole that is 3λ/2 long at 14.15MHz, fed by a λ/2 balanced line "matching" section (approx 520 Ω Zo) and an arbitrary length of coax or low Zo balanced line to a tuner. Varney's articles suggest that an inverted-v configuration of the dipole legs is acceptable, though he recommends the included angle should be greater than 120°. (Varney did also describe a configuration using only open wire line of approx 520 Ω Zo, but that configuration is not nearly as popular as the high Zo / low Zo combination.)
A Portable 2-Element Triband Yagi
Have you ever dreamed about a portable beam you could use at your summer cottage, while camping or on Field Day?
Dream no longer. This portable beam can be rolled up and stashed in your car’s ski boot!
Building the G3TXQ Broad Band Hex Beam
This site provides guidelines to build a G3TXQ broad band hex beam R.F. antenna for the five amateur radio bands, 20, 17, 15, 12 and 10 meters. The G3TXQ broad band hex beam is a new development and actually
easier to build than the older classic hexbeam.
10 Meter Vertical Dipole
A simple rigid dipole made from two lengths of 1/2" electrical conduit that are separated by a 5/8" wooden dowel that is inserted into the ends of the conduit and held together with hose clamps. The dipole can be fed directly with coax, or a balun can be used. It can also be fed with twinlead or ladder line.
CENTER-FED MONOBAND INVERTED LONG WIRE VEE
This project will enable you to build a monoband long wire inverted vee with 3/4 wave length sides that will have a bit of gain, for high band operation and long distance compared to a standard 1/2 wave dipole because of its lower vertical angles of radiation, and added leg length. The longer the leg lengths in odd multiples, the more the gain. It amounts to a very low cost and effective antenna. It is also less directional than the horizontal dipole or straight long wire antenna.
Petlowany Three-Band Burner Antenna
Fundamentally it's a quarter wave ground plane with 4 radials cut for 15 meters. The interesting twist is the spiral coil "hat" on top, which makes the antenna resonant on 20 and 10 meters as well.
The DF9CY Three-Element Antenna for 28 MHz
The 3 element is a commercial antenna by PAN International, which I slightly modified for good performance on the 10m Amateur-Radio band.
Design Frequency: 28.300 MHz
* Usable Bandwidth: 600 kHz
* Return loss: better than 20 dB with center at 28.270 MHz
* Gain: > 7.5 dBi
* Front/Back ratio: > 20 dB
QUAD (2 EL. FOR 10-12-15 MT)
Diamond configuration which gives just 0,1-0,2 db more in the gain than Square configuration. Square-aluminum boom 30*30*1 mm 180 cm length with steel pipe insert.
The spreader to boom attachment (one for each element) is home-made using a square-steel bar (35 cm length); on the tips there are 4 perpendicular pipe (25 mm diameter) where you'll insert poles.
Poles are 5 m length (21 mhz); I use four 240 cm bamboo poles for each element 240 cm length made longer using a short aluminum pipe (25 mm diameter, 100 cm length) as the lower section.
