[R-390] Updated Loop antenna

[Tom Frobase]

I have been working on a band magnetic loop antenna project.  My goal is to
build a simple surface mount phantom powered amplified loop.  Power would
be 12 volts provided through the coax.  It will fit inside a small pelican
case which makes it suitable for outside use.  Small enough for a
backpacker but capable enough to be used in the ham shack.  My question for
this group is whether I should provide a differential for R-390's or just a
single ended output?  Please comment ... tom, N3LLL