On 10/28/2025 7:15 AM, john@kk9a.com wrote:
Back when N6BT owned Force12 they manufactured Sigma vertical dipoles. It
was a sideways H shape fed in the middle and it had handmade wire inductors
to reduce the length. I always thought that was a pretty good antenna for
its size and ease of installation.
Tom has done a lot with loaded vertical dipoles. It's a very interesting
concept. W6GJB has built some that we've jointly designed, based on his
ideas. One of them, for 80M CQP and 7QP county expeditions, worked quite
well, but got destroyed in the wind because the Spiderbeam pole we used
wasn't built the way the vendor said it was, and didn't have the
mechanical strength they claimed. Glen is a fine mechanical engineer,
retired from the space program.
In extensive RBN testing, it outperformed an inverted vee with an apex
at 50 ft by more than 6 dB.
73, Jim K9YC
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