Rick Karlquist wrote:
> Kelly Johnson wrote:
>> I've always thought this as well, but others have claimed this is not
>> true. Can anyone explain why this is the case?
> That's easy. Ground waves are always vertically polarized.
> Thus if the noise is from a ground based source, and starts
> out with both polarizations, only the vertical polarization
> survives any significant distance propagating along the ground.
> This of course is why AM BCB stations are vertically polarized.
> I have taken portable vertical antennas out to places away
> from any power lines and they are as quiet as a churchmouse
> when the band is closed. In those areas, they work great
> as receiving antennas. Just as good as a dipole.
What sort of distances are we talking about here (where the ground wave
hpol dies out).. 10s of meters, 100s of meters, kms?
I would assume that "at the source" the noise is essentially randomly
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