I'm not sure ground the coax shield at the feedpoint is really
necessary, provided the driven element is connected to the boom either
via a matching network (omega match, as on a TH7) or through a shunt
choke ala N9NB. I'm assuming here that the shield is connected to the
tower at the base and the cable runs along the tower, except perhaps for
a rotator loop. Shouldn't the voltage on the coax shield (during shunt
feeding) at the input to the balun be almost exactly the same as that on
the boom? If so, very little current will flow through the balun. I
certainly can't hurt to connect it to the boom, but I'm not sure it's
worth the trouble, with added connectors to weatherproof, etc.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
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