A Few years ago there was a detailed article all about this in QST.
Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 8/19/2019 6:49 PM, donovanf@starpower.net wrote:
Hi John,
Horizontal polarization isn't very effective on topband except for local
QSOs. It would be far better if you could install an inverted-L vertical
73
Frank
W3LPL
----- Original Message -----
From: "John Harper" <johnae5x@gmail.com>
To: topband@contesting.com
Sent: Thursday, August 15, 2019 11:57:49 PM
Subject: Topband: Effect of trees on vertical elements?
I'm thinking of installing an end-fed half-wave dipole as an "inverted U"
for 160m. My tree geometry is such that the antenna would be fed at the
base of a tree, then go up it to 120 feet. Then about 90 feet to another
tree and down it to complete the length of the antenna.
Would the close proximity of the vertical portions to the two trees
adversely affect the antenna's performance?
Last year I used my 80m dipole-110-foot vertical feedline as a top-loaded
vertical on 160 - it worked well as a transmitting antenna but was a poor
receiver due to noise so looking for another option.
Tnx/73,
John AE5X
https://ae5x.blogspot.com
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