I'm not sure one would ever notice the tree effects on HF. There are
lots of other things (e.g., no balun at the feedpoint, feedline routing
and objects in the near field, ground terrain variations ) that would
probably be larger effects.
I had an commercial BC TV engineer relate to me a story of the
importance of attenuation in "trees" for HDTV (UHF). One station near
the NC coast (beaming inland) made an argument that the long leaf pine
needles were the right size to selectively attenuate their signal. They
managed to get a somewhat higher permitted power. It would have been
interesting to actually have a measurement of the effect.......
73 de Brian/K3KO
On 4/9/2014 13:52, john@kk9a.com wrote:
I have had great results with dipoles hung in trees.
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: Fwd: Hustler 6-BTV installation
From: Hans Hammarquist <hanslg@aol.com>
Date: Wed, 9 Apr 2014 00:02:05 -0400 (EDT)
Have the same experience hanging various verticals from trees. I guess if you
have a perfect, non-conducting tree it will work. Unfortunately trees are
somewhat conducting, enough to mess up the radiation.
It will work better if you don't use a tree but a non-conducting support such
as a large plastic pipe. A thicker, self-supporting conductor such as a tube
would also work.
Maybe you get what you pay for.
Best 73 de,
Hans - N2JFS
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