Yes, been there .. done that. Couple of things to take into consideration.
1. How long will that contraption be up there? 2. what is the size of the
aerials? 3. Do I have a young warrior ready to re-climb in the future?
Here's how I did it, many times. .. works on telephone poles too .. cut 2
GOOD 4X4 fence posts.. like, wider than the tree by a foot or so on each
side. drill appropriate holes to straddle the tree top (ASSUMING YOU HAVE
TOPPED THE TREE, SO NO SPRIGS ARE TRYING TO WORK THE WORLD!) Then, use
ALLTHREAD .. take your time, make it work for you .. when you drill the
holes in the 4X4s, make sure to leave a few inches out from each side ..
wider than the tree .. else, hard to tighten, and not productive. Now ..
before you do this, make sure you have mounted the MAST on the 4X4s .. or ..
ready to .. this is up to the installer to figure out the logistics... Mount
the MAST with ALLTHREAD --- stick the rotator, add the aerial . away ya go.
You may need to put a shim on the top 4X4 to keep things vertical! The
ALLTHREAD keeps the contraption from spinning in the wind. I used this many
times for mounting FM Broadcast Translator antennas on trees/poles, with a
longer 4X4 and the horizontal "mast" .. like ten foot .. w/elbow at one end,
so one 10 el Scala antenna horizontal, the other vertical .. laid the mast
on top of the 4X4 horizontal, using ALLTHREAD, which . btw .. allowed
"downtilt" -- could point the array, because the ALLTHREAD held it in
place.. Not sure that was "legal", but, antennas sometime "shift,
n'est-ce-pas?... Anyway .. NEVER had a problem through the years with that
type of setup--- 73, Mark AA6DX
To: <towertalk@contesting.com>
Sent: Thursday, September 05, 2002 6:15 PM
Subject: [Towertalk] Tree Mounts
> Does anyone have experience with mounting yagi's to trees?
> If so, where might I find someone capable of fabricating a suitable
mounting
> bracket?
>
> I've heard this used to be quite common in the Pacific Northwest.
>
> Kelly Johnson
> N6KJ
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