In article , Ed Huntress says...

That's the rule-of-thumb, but it only applies to line-of-sight (VHF) or
other space-wave transmission (some ducting, satellite, etc.). There's no
way to predict polarization in sky-wave, which is ionospheric skip. And true
ground wave is always vertical, as one end of the wave is "sunk" into the
ground.

Sure this all sounds right in theory. But if there are other metal
items nearby they're going to scramble the polarization, so he
really doesn't have to work too hard to get a vertical antenna.

Other mobile homes count pretty well as devices to convert from
vertical to horizontal.

Jim


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