If you can't view this video, please enter this title URL into your browser search box: https://www.youtube.com/watch?v=8ijIICTN391.
Helically-wound antennas can be a lot of fun to design, build, and use. In this video, Bob (KC4FNE) shows us his home-brew 20 meter rotatable dipole antenna during a presentation before the Virginia Tech Amateur Radio Association meeting on 05 February 2014. The only drawback to these helically-wound antennas is a fairly narrow bandwidth. I've built a few vertical helix antennas for 40 and 80 meters where vertical space was limited. All of them performed well, given the narrow bandwidths inherent in the design. In Bob's design, a ground radial or counterpoise system is not required for operation.
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Aloha es 73 de Russ (KH6JRM)