[Towertalk] GAO Challenger DX

[n4kg@juno.com]

Ground Reflections from Horizontally Polarized antennas are
very efficient, suffering only 1 to 2 dB loss regardless of how
poor the conductivity of the ground.

Ground Reflections from Vertically Polarized antennas are
HIGHLY dependent on the ground conductivity and are typically
much higher than for horizontally polarized antennas unless the
reflections are over Salt Water.

On the Low Bands, verticals are often better than (low) dipoles
for DX where a 1/2 WL high 80M dipole needs to be 140 ft up!

Tom  N4KG

On Sun, 6 Oct 2002 "Jim Shaw" <Jim@shawresources.com> writes:
> >...if you want to consistently be #1 in the pileups or turn-in big
> >contest scores you likely won't be happy with that antenna (or most
> >other verticals).
> 
> >Agreed.  As you can read in U S Army Signal Corp manuals, calculate
> >by means of NEC-4, and/or prove for yourself by experiment, for DX
> >(as opposed to short-range ground-wave work) a horizontal dipole
> >beats a vertical antenna of the same height.
> 
> Hmmm, wonder if that is true for a vertical 'dipole'?  Always 
> thought at
> some heights, the vertical 'dipole' might have an edge.  Likewise, 
> at some
> heights, seem to recall that an inverted vee (30 degree droop below
> horizontal) might have the edge over a horizontal dipole.  I realize 
> the
> vertical orientation causes secondary lobes at some heights but 
> seems like
> that can be used to advantage if the height is properly chosen.  Not 
> sure
> the horizontal dipole is absolutely always the best for dx when 
> compared to
> a vertical (dipole).
> 
> Of course, wouldn't be the first time I got confused.
> 
> 73 de Jim WA6PX
> JGShaw@Alumni.HAAS.org
> 
> 
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of Chuck Counselman
> Sent: Sunday, October 06, 2002 7:04 PM
> To: towertalk@contesting.com
> Subject: Re: [Towertalk] GAO Challenger DX
> 
> 
> At 9:12 PM -0700 10/6/02, Mike Lazaroff K3AIR wrote:
> >...if you want to consistently be #1 in the pileups or turn-in big
> >contest scores you likely won't be happy with that antenna (or most
> >other verticals).
> 
> Agreed.  As you can read in U S Army Signal Corp manuals, calculate
> by means of NEC-4, and/or prove for yourself by experiment, for DX
> (as opposed to short-range ground-wave work) a horizontal dipole
> beats a vertical antenna of the same height.
> 
> -Chuck, W1HIS
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