Just a thought - build a 40M 1/2 vertical out of wire - center fed with coax
running 90 degrees from antenna as far out as you can.
Works well here as I have another shorter tree to secure the coax to.

[ TREE 70 feet
[
[
[
[________________ coax 32 feet TREE
[
[
[
[
[ Antenna 64 feet

-- --------- ground


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"Alex" wrote in message
le.rogers.com...
Has anyone tried building a 1/2 wave coaxial sleeve antenna for 40m? I
have
a large tree with a branch at 70' and i thought i'd pull the antenna up
with
a rope. Should i make the sleeve out of copper pipe? A 1/2 wave vertical
would be a nice antenna for 40m and i thought a coaxial sleeve antenna
would
give me a great feed impedance. Any thoughts? The coax are 100' of RG8.