I am very interested in the current Loop discussion, since I have been using
Loops for reception for over two years.These are elongated, grounded loops
300/400 feet long and only 20 feet high .Since they are recieving loops
thick wire is not necessesary, they are grounded at each end which means
that a return wire is not required. This also discharges static and because
of the ground penetration, probably increases the effective area of the
loop.There does not seem to me to be any advantage in having an elevated
bottom wire, the wavelength is so long that a
few feet is negligable, so for tranmitting it would seem to be a good idea
to have a
bottom wire on, or in the ground.This would have the added advantage of
making it possible to use a very thick or multiple thick wires for this part
of the loop thus reducing the total loss resistance by almost 50%, with a
consequent considerable increase in efficiency.
I can also recomend a bow and arrow  for launching wires over trees,although
I hav'nt reached 150 feet! HI.    73a Laurie.