Wow, lots of questions...
But, you need to know the feedpoint impedance of the loop... and regarding
the feed line, you do realize that it is most likely going to work as a
matching (or MISmatching network) depending on its electrical length? It
would impossible to recommend either a 4:1 or 1:1 balun unless the antenna
has been modeled and these important parameters known.
There are some nice snap-on molded spreaders that are designed to be used
with THNN electrical wire--they work quite well.
By the way, some time back I tried a similar setup, and ended up with
extremely high RF currents--end up melting PL-259 and SO-239 fittings,
damaged a Dentron 3kW tuner, and blew the snot of out a 1:1 DX Engineering
balun--which was at a high voltage point.
Pete
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