Other than a narrow bandwidth, this antenna provided multiband capability at a modest cost. The key to this antenna design was the 9:1 balun used in the feed line.
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Here are some comments from Walt (K4OGO):
I built a multiband helically wound vertical antenna from parts that I had with me in Poland. I had amazing results.
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Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).
