Several years ago I put up a full size loop for 5 MHz and fed it with a pair of
rg59u coaxes using the center of each coax to either leg of the loop. The
shields were tied together out at the antenna but left floating/unconnected at
that point. In the shack each coax center was tied to the balanced output of
the tuner and the shields tied together to the case of the tuner. Along the
run of the twin-ax as I liked to call it I used nylon zips to keep the two
parallel to each other. I found this arrangement to provide a better signal to
noise ratio on the loop than either twin lead or coax alone. 1kw was put
through this line on several occasions with no ill effect and a lot of PSK31
was done at low power on 30 meter band.
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