Skip to main content

Simple Ham Radio Antennas: Building a multi-band HF Dipole Antenna. Post #312.

Do you want an efficient multi-band HF antenna that occupies a small space and requires the minimum of construction and maintenance? Then, this video from Larry, the "Radio Ham Guy" is for you. Most of the materials will be found in your ham shack, garage storage room, or at the nearest home improvement or hardware store. This version of the popular "fan dipole" requires only one 50 ohm coaxial cable feed line, a center coax connector, a few end insulators, a tall support and a few tie off points above ground to work. Using the familiar dipole formula (468/f(MHz)=L(ft), you cut separate dipoles for each band of use, connect them to a common center connector, and "fan out" the various elements to nearby support masts, trees, or any other tall object. With careful trimming (beginning with the lowest frequency band of your choice), you can probably get a low SWR for each amateur radio band you chose. I always use an antenna transmatch (i.e. "tuner") as part of the antenna system, just to get the best match possible. It is possible to use the 40 meter dipole on 15 meters if you cut the 40 meter segments to the lower portion of the band. This will make the antenna work as a third harmonic in the phone portion of the 15 meter band. When in doubt, just make a separate 15 meter dipole, attach it to the common center connector, and "fan out" the dipole elements like the other dipoles. This antenna doesn't require a ground plane and will give you years of good service. To reduce the chance of stray rf getting into your shack, you can insert a 1:1 balun just below the dipole center connector. Or, you can "roll your own" rf choke out of a few feet of your feed line. Larry's video is clear, concise, and well-presented. Antenna building is one of the few pursuits amateur radio operators can do that doesn't require a lot of cash or time. Wire antennas can work just as well as commercial products. For the latest Amateur Radio News and Events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free e-mail subscription or by tapping into the blog RSS feed.Aloha es 73 de Russ (KH6JRM).


Popular posts from this blog

G5RV Multi Band HF Dipole Antenna. Post #1555.

If you can't see the video, please insert this title URL into your browser search box: This well-produced and richly illustrated tutorial on the classic G5RV HF Dipole Antenna was presented to the Brandon Amateur Radio Society in Brandon, Florida in 2017 by Bernie Huth (W4BGH).  Bernie does an excellent job of  explaining the pros and cons of this popular HF antenna from the late Louis Varney (G5RV).  Although Varney envisioned his design primarily as a 3/2 wavelength antenna for the 20 meter Amateur Radio band, radio amateurs have used the antenna for multiband use.  The G5RV is an excellent choice for the 20 meter band.  Performance on other HF Amateur Radio bands is good enough to qualify as stand alone HF antenna if you can only erect one HF antenna. For the latest Amateur/Ham Radio news and information, please visit these websites: (a wee

Amateur Radio Bicycle Mobile Setup. Post #1554.

If you can't see the video, please insert this title URL into your browser search box: Here's a way to use Amatuer/Ham Radio while you work on shedding a few pounds in useful exercise.  Why not equip your bicycle for 2 meter/70 cm mobile operation? In this short, well-made video, "taverned" shows us how he used a mag mount antenna, a simple C clamp, and a basic ground system to convert his mountain bike into a mobile station.  The project is straight forward, simple, and gives you emergency communications while you peddle down the road. For the latest Amateur/Ham Radio news and information, please visit these websites: (a weekly podcast which is updated each Friday afternoon). (Amateur Radio News & Information).

An 80-Meter Vertical Helix

Like many amateur radio operators, I live on a small lot surrounded by neighbors, utility lines, and civic-minded citizens concerned about the "attractiveness" of my community.  Whether by design or outright fear, I've adopted the "stealth" approach to ham radio antennas.  It's the old "out of sight, out of mind" idea applied to amateur radio antennas. The amateur radio press is full of articles describing the struggle of amateur radio operators to pursue their hobby under the burdensome regulations of CC & Rs, HOAs, and other civic minded citizens who object to antenna farms.  So far, my modest verticals, loops, and inverted vees have blended well with the vegetation and trees bordering my small backyard.  Vertical antennas have always been a problem because of the limited space for a radial system.  There are times, however, where a shortened vertical for the lower HF bands (such as 80/75 meters) is necessary where horizontal space is lack