Mauri, I4JMY wrote:
"... although better if also the yagi fed element is grounded (hairpin)
in most cases there is not an absolute need to ground it to the boom if
the yagi coax runs tightly with the tower legs and its shield is grounded
at the tower base."
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I always recommend that shunt-fed tower users tape the beam coax (and
rotator cable) to a tower leg on its way down to the ground. This indeed
couples the driven element to ground and incrases the top loading effect
if that element is not hairpin (beta-match) fed. I disagree that the
beam coax should be grounded at the base of the tower, however.
73, de Earl, K6SE
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