On 4/8/2014 4:25 AM, john@kk9a.com wrote:
I just read the Joel Hallas, W1ZR article - "The 43 foot vertical monopole
- What's the magic?". It was very interesting! The coax losses are worse
than I imagined, up to 8dB though 100 feet of RG-213, and as my model
showed the radiation is very high above 20m. Certainly a relay to
electrically shorten the antenna would help 15m and 10m.
I haven't seen Joel's piece, but my take on 43 ft verticals is at
k9yc.com/publish.htm I showed this at Pacificon last fall. There's also
a link to AD5X's extensive work on the topic.
73, Jim K9YC
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