Greetings,
I am trying to set up an HF station and don't have a readily available
ground at my shack location. I have heard that it's possible to run a
wire from the ground connection on your radio, not connected to anything
else, as a "fake ground" as long as you cover the end of the wire (if
coax, as I'm hoping to do) with teflon tape so that it's not exposed.

I was thinking about using 75 ohm coax for this purpose, but was wondering
if that is a bad idea (i.e., 50 ohm coax to attach to the 10m or 20m
antenna and then 75 ohm wire for the "ground"). Has anyone else has
experience with this set-up?

Thanks,
-john (W4PAH)