On Friday, December 6, 2019 at 12:34:38 PM UTC-8, Eric Jacobsen wrote:

(big snip)

Another thing to keep in mind is that in multipath even linearly
polarized signals get rotated at potentially random angles, so even if
the tx is horizontal, the rx will be getting whatever LOS horizontal
energy plus whatever randomly-rotated relfected energy. Many TV
receivers are non-LOS, (e.g., indoor), so a rabbit ear antenna will
often wind up with all kinds of wacky angles for best reception of a particular transmitter.

Yes.

I suppose there is a rare case of someone a long distance from a
transmitter over ground so flat that it is LOS with no reflections.
(Though there could be reflections off neighbor's antennas.)

It happens that I can see some transmitting antennas out my living
room window, and have attic antennas pointing in that direction.

But there are other transmitters around, and some still come though.

An antenna rotator is convenient, in that one can rotate for maximum
signal, independent of actual transmitter direction.

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