In article ,
Yuri Blanarovich wrote:

I think there is a major misconception that verticals are more sensitive to
noise because the noise is "vertically polarized". Man made, appliance or
otherwise produced noise is "all kinds" polarized. It is the antenna's location
and radiation pattern that determines the amount of noise or S/N pick up.

Well... yes and no (I think).

As I understand it, ground-wave / surface-wave propagation occurs for
vertically-polarized signals (or signal components), but not for
horizontally-polarized signals (or components). Even if manmade noise
is polarized in all planes with equal (or randomly distributed)
polarization senses, only the vertically polarized portion of it will
travel via groundwave propagation.

So, I suspect that the noise-proneness of vertical HF antennas
compared to horizontal dipoles, probably results from a "double
whammy". The horizontal antennas aren't exposed to anywhere near as
much energy propagating via groundwave (because horizontally-polarized
noise doesn't travel well in that mode), and they aren't as sensitive
to it because they often have fairly high radiation angles with a
substantial null towards the horizon.

The vertical antennas are hit with more noise energy, and due to their
low radiation angle they're pretty good at picking it up.

--
Dave Platt AE6EO
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