[Elecraft] Low antennas in high places

[Paul Gates]

This is all interesting and especially to me because at our club meeting 
tonight the program is going to be on NVIS antennas! Rol Anders one of our 
guys and chief engineer of the corporation that used to be Westinghouse..... 
can't think of the present name right now.... Anyway he has the program on 
NVIS antennas and he is writing an article for QST.
Paul Gates
K1  #0231
KX1 #1186
XG1
kd3jf at hotmail.com


----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: "'elecraft'" <elecraft at mailman.qth.net>
Sent: Thursday, August 11, 2005 1:19 PM
Subject: RE: [Elecraft] Low antennas in high places


> Ron wrote:
>
> >The advantage of low dipoles on slopes for DX noted by Moxon
> >is that the earth behind the radiator acts as a reflector.
>
> For an HF dipole installed along a stony cliff or bluff, I've always had 
> my doubts that the earth and stone behind the dipole act much like an 
> effective ground reflector.  If the height above average terrain of this 
> cliff dipole is, say, 1000 feet, I suspect that the antenna actually 
> functions mostly as if it were just a dipole that is well elevated above 
> average terrain level ground.  But I may be wrong.  I've had good results 
> when I've been in a position to use a near-cliff dipole, but I never tried 
> to determine if there was any noticable directivity effect.
>
> Similarly, if the same antenna is centered on an elevated narrow ridge, 
> how well will the elevated earth of the ridge actually function as an 
> effective antenna ground, compared to the ground effects of the terrain at 
> the bottom of the ridge?
>
> 73,
> Mike / KK5f
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