Jim.....You hit on a good point with a 1/4 sloper that it should be some
distance, in your case 5 feet, from the tower at the top or high voltage
end. Having the top right at the tower seems to deteriorate the
performance overall as many who have tried this seem to underscore. What
you have presumably are two verticals with an a periodic reflector which
is your tower. Having switchable gain both on RX and TX and some F/B is
great. I am glad you confirmed this with both NEC and on the air tests.
While Jim's system is better, most people want to feed these things against
the tower. With the shield attached to the tower, the tower is the ground.
This is where all the problems with operating inconsistency come in.
73 Tom
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