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Re: [TowerTalk] Dipole Ends

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Subject: Re: [TowerTalk] Dipole Ends
From: "Jim Brown" <>
Date: Sat, 30 Aug 2008 06:42:57 -0700
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On Fri, 29 Aug 2008 14:58:44 -0500, Tim N9PUZ wrote:

>what is a 
>good technique for attaching to the tree trunk? Screw eye into 
>trunk itself? Some sort of belt type affair around the trunk?

All of my antennas are hung in tall trees -- redwoods, Douglas 
Fir, madrones -- so I've researched this issue a lot. The 
executive summary is that screwing a eye or hoot lag bolt into or 
through the tree trunk is the least invasive for the tree, and is 
the method of attachment recommended by tree experts. It's also 
the most expensive, because you've got to hire a climber to get it 

I also endorse the use of marine pulleys and a good counterweight. 
Some have used old window weights. My antennas are up higher, fed 
with RG11, and are rather long, so I need about 100# tension. I 
bought 6.5 gal water jugs and filled them with dry sand (roughly 
1.5x the specific gravity of water). I also try to use very robust 
construction techniques. #10 copper, either bare or insulated THHN 
(house wire) and the most robust center and end insulators I can 
find. I use the 5/16 inch rope that DX Engineering sells. 

W3DQ found a product called a Cambium Saver. It's a fabric 
sleeving system that fits over a big branch. He described it in a 
very nice presentation he did at Visalia this summer. It's an 
alternative to the lag bolt/screw method, and can be pulled up 
with a rope that you have launched into the tree. 


Jim Brown K9YC


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