I am in the process of constructing a compact loop for 80 meters. The loop
is constructed from 3/4 inch copper pipe in the shape of an octagon with a
perimeter of 72 feet, and the plane of the loop is vertical. According to
the literature, a loop of this type usually has a remotely tuned capacitor
in series with the top side of the loop, and the loop is feed at the bottom
with a gamma match.

For mechanical stability reasons, I would like to have the tuning capacitor
at the bottom of the loop, and feed the loop at the top of the loop. The
coax would be constrained to lie in the plane of the loop and would drop
vertically from the top of the loop to the ground. What disadvantages, if
any, are there to this second method of loop construction?

For more details of my project, see http://tinyurl.com/bwobb