On Sat, 09 Dec 2006 07:27:39 -0800, John Smith
wrote:

Dave wrote:
...

Most all verticals have higher noise levels than horizontal antennas.
Reason, as it is reported, is that man made noise is vertically polarized.


Dave:

Frankly, I think that the statement, "most man made noise is vertical
polarized" is a myth. How many power lines do you see running

Perhaps the explanation for the observation that the vertically
polarised component of man made noise is greater at a receiver antenna
than the horizontal component lies in the propagation mechanism.

Most man made noise is received from nearby and by ground wave, and
vertically polarised ground waves are attenuated less than
horizontally polarised waves over the same path.

This explanation is supported by the observation that the closer one
is to a high intensity man made noise source (but still within
radiating far field), the less variation in field strength with
antenna polarisation.

Owen
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