One trick to alter the resonance of an antenna like a sloper or an end fed
inverted -U recommended by the late G5XB would be to put a varible
capacitor between the remote end and ground.
This would alter the resonance and could be useful for those without real
estate!!
With an end fed inverted-U you could alter the current point of the antenna
which could be interesting if you put a tuner at the feed point and a
varible capacitor at the far end !!
Just an idea to experiment with - High voltage caps recommended !!
best 73s
Bob Parkes
S21YP/G3REP
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