Bill Ogden wrote:
I seem to remember reading that running coax underground acts like a current
choke. However, my memory has many missing bits these days. Is this a true
statement about coax underground? In my case the run is about 40' (in a
conduit that is about 10" under ground). I am interested only in the normal
HF bands.

Bill
W2WO

I believe Richards' comment is 100% correct. However, I would still run
a current-choke/balun/unun, unless the antennas radiation pattern was
designed around the outer shield acting as a counterpoise ...

Regards,
JS