I have been tinkering with a 43 ft ground mounted vertical with an extensive
buried radial field. With a 4 to 1 voltage balun at the base, I have a good
swr match particurlarly on 20 meters, and the antenna radiates and recieves
comparabily with my 10 horizontal cage doublet fed with open wire
ladderline.
I recently replaced the coax that feeds the balun at the vertical's base
with 450 ohm twin lead utilizing the same balun at the antennas feedpoint,
and still get a decent signal report...again comparing to the big cage
dipole. The twin lead is enclose within some left over grey plastic conduit
if anything to keep it out of the weather and to keep it about 2 feet off of
the ground, parallel to the ground.There is no evidence ot the plastic
conduit detuning the twin lead.
Tuning via either a link coupled transmatch or a dentron super tuner plus,
utilizing its internal balun is broad smooth and no evidence of rfi in the
shack with the exception of 30 meters.
Wonder if anyone has tried this before and how did they like this feed
arrangement.
Thanks in advance, de Denton WB7TDG