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Re: [TowerTalk] tree strung dipoles

To: Michael Ryan <>,
Subject: Re: [TowerTalk] tree strung dipoles
From: jim Jarvis <>
Date: Mon, 19 Oct 2009 11:16:20 -0400
List-post: <">>
I have 1/8" olive drab dacron line which I favor.   For longer term  
I also have some 1/4" o.d. dacron.    Have used both with a low  
profile carolina windom
here in NJ.

I bought some 1/8" kevlar line, black, as well, but find that's a bit  
stiff and
heavier than the dacron.   As a result, it's harder to get launched.

My technique is to use a fishing arrow and game-tracker system.     
The game tracker
string is 15 lb test.   Depending on tree height, this may get you a  
direct from
game tracker to 1/8" dacron transition... for taller trees, you may  
need to use some
intermediate string... and I bought a reel of mason's string from  
Home Depot for $5 which
serves that purpose.

Based on experience, I've settled on #12 insulated flexweave wire as  
my standard,
and have run up to 1.2 kw without end insulators, by simply tying a  
loop in the wire,
and another in the dacron line.

One caveat:   When working with pine trees, the sap will glue the  
rope to the tree,
resulting in real stress on the antenna.   It will be nearly  
impossible to pull the line from
the tree, if you want to take the antenna down.   Thus, in this  
situation, I would favor
use of pullies.

Up in VT,  I had a 160m windom held up by 1/4" o.d. dacron, between  
two 140' pine trees.
Came time to bring it down for some maintenance.   I wound up having  
to tie a turning block
to a line at the  base of the tree, and run a line down to my jeep,  
100' away.   I backed down
the driveway a reasonable distance, heavily tensioning the line.     
Then, suddenly, it went
slack..    as a branch came down from on top,  4" in diameter!      
The damned dacron rope
was embedded in the thing by almost 1/2", and glued fast with sap.

The mass of that branch coming down from 100' would have killed  
anyone under the tree.
Appropriate caution is advised.


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