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Just some more comments.  Actually you are all pretty much correct in the
Vertical/Horizontal thing, however, most VHF antennas on airplanes are not
true vertical antennas.  They are usually swept back somewhat for
aerodynamics.  There is about a 20db difference in a true vertical to
Horizontal polarization, which is huge (about 95 times), but if you use a 45
degree antenna, then the difference between horizontal to vertical is only
about 3db (2 times).  I doubt that when you really need to use this antenna,
it is going to be truely vertical, or horizontal, and I think the best
orientation would be to install it somewhere where it is not in close
proximity to any other antennas, or other metals of any kind, and wherever
that ends up via vertical or horizontal will be just fine.  The satellites
that receive the signal, and pinpoint the location of ELT's receive circular
polarization, which means that it doesn't matter if it's horizontal or
vertical, it will receive the signal the same.  At the VHF frequencies, the
signal will actually reflect off of mountains, buildings, or whatever is
there, and spread the signal out to vertical and horizontal signals anyway,
so don't spend alot of time with making it flat, or straight up.  Just keep
it away from other possible interference, and make sure it is resonant to
121.5Mhz using a high quality SWR meter.

Ron Galbraith
LNCE - N5ES (40%)

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