By Kees Wiegers, PA5CW (ex-PA3BHS)
It looked impossible to get a large beam for 20 meters up a tower, but it was something I always wanted. So after attending a presentation by John Devoldere, ON4UN, of Merelbeke, Belgium, I decided to try and build my own beam.
At the presentation, John demonstrated software for designing Yagi antennas. From a collection of about 100 antennas you could choose the most suitable for your needs. I was interested in a compact beam for the 20 CW part of the band. If you choose a narrow bandwidth such as for the CW portion of the band, you can optimize gain and front to back ratio for that part of the band.Continue reading