On Thu, 15 Mar 2018 15:36:21 +0000, Gareth's Downstairs Computer
wrote:

What is so special about that magical length, for it does
not appear to be resonant anywhere!

If you're building an all ham band antenna, you don't really want any
resonances, which are difficult to match, always end up on the wrong
frequency, and tend to move around.

http://www.hamradio.me/antennas/answer-to-everything-43-feet-antenna.html
http://www.ad5x.com/images/Presentations/Vertical43RevA.pdf

With an antenna tuna and ground radials, the 43ft vertical is easily
matched on all bands except 10m without any irritating resonances, and
has a decent pattern for an all band antenna. However, it's major
beneifit is the LACK of any resonances in the ham bands.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558