A lot can be done with two tribanders. Besides changing the radiation
angle you can also beam in two directions which is very useful if you
contest.
I had BOP capabilities with my 40m beams. I thought that it would be great
for the one domestic contest (November Sweepstakes)that I operate however
I have never found this option useful. I have never tried it on other
bands.
John KK9A
To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] How High is enough...(HFTA) now
From: Cqtestk4xs@aol.com
Date: Wed, 31 Jul 2013 21:31:30 -0400 (EDT)
Having the ability to change that optimal angle is a big advantage.
Although my stacks are all very high, the ability to BIP/BOP them allows
me to
accommodate the higher angles that are not covered by the higher antennas.
Of course, if you don't have stacks, you can do the same sort of thing
with a second antenna at 50 feet. Not only does this allow a change of
angle,
but with this proper phasing apparatus you now have a second antenna...but
also a stack that can be switched in and out of phase.
That would be my recommendation.
Bill K4XS/KH7XS
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