Homemade antennas HF/VHF/UHF
Sep 13, 2009 Homemade
Homemade antenna Design
HF multiband homebrew antennas
- G5RV Multi-Band Antenna
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”. - The W3FF Portable Dipole
This is the antenna I designed for my ‘walking portable’ station. It is a dipole constructed out of the plastic plumbing pipe CPVC. There are telescoping whips at the ends of each side of the dipole, and these whips are adjusted to bring the antenna into resonance on each of five HF Bands…..10, 12, 15, 17, and 20 Meters. - Miracle Whip portable antenna
The whip described here will tune up to a respectable SWR on 40 metres and up. - W5DXP’s No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna
This 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
Magnetic loops antennas
- Magnetic Loop Antenna by Minnesota QRP Society
The frequency range of this loop goes from 14 MHz to 7 MHz and works fine. The biggest problem is the tuning capacitor, if you transmit with a power
of 100 W you need a capacitor with a voltage rating of 5000 Volt. - Portable Magnetic Loop Antenna Version Two
Described here is a simple multi-band magnetic loop antenna designed for 20, 30 and 40 metres. For its size, the performance of the antenna always astounds me, although it is never going to replace a Yagi!
Antenna analyzers
160m homemade antennas
- Matched long-wire antenna by RU3AEP
Building an efficient antenna is a big problem for an radio amateur. HF antennas, especially for lower bands, have large sizes and have to be mounted on a big height. In many places, especially in the city, there is not enough room to erect the full-size dipole or ‘inverted V’ for lower (160 and 80 m) bands. - EH STAR 160m antenna by iz1dug
160m antenna - 160 Meters by ve2dpe
One side of the dipole goes up from near ground level to about 14 meters (45 feet), then out (25 meters) toward the front of my lot. This portion becomes an inverted “L” ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7×22) copper-clad antenna wire - 160 Meter Dipole Antenna at W5JGV160 Meter Dipole Antenna at W5JGV
A big screw is placed in the tree, and a 16 cm length of gray PVC pipe was used as an insulator. The antenna wire is some of my handy 17 Gauge aluminum electric fence wire.
- 160m coaxial receiving antenna
To construct the 160m loop you’ll need 20ft on RG-59. Fold the RG-59 in half. On the 160m loop, it would be about 10ft from the end. On the 80m loop, it would be about 5 ft. from the end. You then mark the center, then measure 1/2 an inch on both sides. Strip away the outer cable, the braid, and then the foil covering the center conductor insulation. - 160m L antenna
One of the problems with short, low antenna’s on 160 metres is that their input impedance is very low, usually on the order of a few ohms.
A clever trick to overcome this is to intentionally make the antenna to long. This will make the resistance increase, but also add inductive impedance.
80m homemade antennas
The 80 meter inverted vee is a common and classic antenna. Like all inverted vees, it requires a single center support, which is often times a tower which is topped with a Yagi or quad for the upper bands.
Why might the inverted vee be preferred to the dipole? The first reason usually given is mechanical – only one high support is required. The dipole will require at least two, and if the dipole and feed line are heavy enough, there might be so much sag in the middle that you need three high supports. The single center mounting point of the inverted vee can support the antenna as well as the feed line. Since the two legs of the antenna slope towards the ground, the vee requires less horizontal room than the original dipole. If the apex angle is 90 degrees, the inverted vee will require approximately 70 percent of the ground space needed by the flat dipole. Since an 80 meter dipole is approximately 130 feet long, and a 160 meter dipole is approximately 250 feet long, this space reduction can be critical in getting the antenna to fit into our typical backyards.
Dipole and Inverted Vee Pattern at a 36 Degree Take-Off Angle
40m homemade antennas
One of the easiest antennas to build is the half-wavelength dipole fed with coax.
Linear loading has been around for many years in the design of 80 and 40-meter Yagis. One of the first antennas I can recall was the Hy-Gain 402BA, a 40-meter, 2-element design with 46-foot elements on a 16-foot boom. Other manufacturers cop- ied the concept in their Yagi designs. The shortened dipole presented here is the result of using computer modeling initially to verify the concept, and actual construction to verify the modeling. Not surprisingly theory and reality are very close.
30m homemade antennas
- Not documented
20m homemade antennas
- Not documented
17m homemade antennas
- Not documented
15m homemade antennas
- Not documented
10m homemade antennas
The simple aerial performed better than a centre fed dipole at the same height.
Design information:
- Frequency 28.8 MHz
- Wire length = 16Ft 3In
- Matching section = 5Ft 8In of RG213 co-ax. VF 0.66, short circuit at botton, feeder tap at 9 In from bottom.
Despite the fact that I used 75 Ohm low-loss satellite TV co-ax as the feeder, the SWR is 1.1 : 1 at 28.6 MHz and less than 1.5 : 1 from 28.3 to 29 MHz.
6m homemade antennas
- Not documented
VHF antennas
- Not documented
UHF antennas
- Not documented
Antenna Articles
- Not documented
Homemade CB antennas
- Not documented
Antenna Calculators
Antenna Theory
Mobile Antennas
Antenna Tuners
Antenna/accessories Manufacturers
- antennex
- force12inc
- diamondantenna
- buxcomm
- NCG amateur radio antenna
- Tuners, analyzers, SWR meters, accessories
- Antenna testng
- PALSTAR ZM30 Antenna Analyzer
Home made / homebrew antenna links
The 80 Meter Inverted Vee (Original)
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November 7th, 2009 at %I:%M %p
Nice article.Much useful-thanks