I'm partway through installing my own outdoor TV antenna.
I've gone with a "through the roof and screwed into a beam" method rather than the "sit on top of roof and stabilise using 3-4 wires screwed into points on roof a few feet away" method.
PROBLEM: My antenna mast seems to be "shakier" than my neighbour's antennas though: it sways back and forth a little in light wind.
It's a pretty solid mast 3m (10') of 19mm (0.75") diameter, 1.6mm (0.063") thick galvanised steel, so I thought it'd be fine (looking at it now, some neighbours antennas do appear thicker, though it's hard to tell).
QUESTION: Is a little bit of movement going to affect the TV signal significantly? Do TV antenna masts need to be very rigid, or just steady enough so they're not swaying like crazy?