On 11/18/2025 7:50 PM, john@kk9a.com wrote:
When I saw fan dipole listed as the 40/80 antenna I was thinking of a
homebrew dipole with separate wire elements attached to a common center
insulator (and maybe choke).
Since we can't do attachments on this reflector, I'm posting a link to a
pdf of VERY old slides for a "practical antennas" talk I did for a local
club soon after moving to W6. Page 11 shows the loading coil for an
80/40 loaded dipole, pages 15 & 16 show current distribution. Pages 26
and 27 show the first fans I built after moving here. This was an
antenna sold in the back of QST by a guy in PA, that I bought when I was
getting back on the air in Chicago in 2003, and didn't have the stash of
stuff to build something. The loaded design just fit between the two
points where I could get a friend to rig it (the roof of the house was
WAY too steep for me).
http://k9yc.com/LimitedSpaceAntennasPPT.pdf
BTW -- I've changed my thinking about the effectiveness of vertical
dipoles after the extensive modeling study I did about ten years ago,
showing the dependence of verticals on soil quality. Ground quality at
my QTH is really poor.
73, Jim K9YC
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