I did something similar (1.5 inch sweep in the concrete base) of a former
tower. Big mistake. Use at least a 3" conduit. Schedule 40 seems to be
I have a coax switch control cable, a rotator cable, two coax cables
(buryflex), and one SteppIR control line. They are very small in a 3"
conduit, but pulling another cable is already a nontrivial job. Remember
to use a very good "messenger" or "tag" or "pull" rope. I used a 1/4"
dacron line that should stand up to moisture. There always seems to be
condensation in the conduit.
I used two 90 degree schedule 40 turns at the antenna end and I remove
these when pulling a line. They just sit on top of the vertical 3" conduit
that emerges from the ground. (On my current tower, I did not embed the
conduit in the tower base.)
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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