I live in Ar. & we have the same problems when the temp drops bellow about 38 degrees we lose all but two of our stations
Here, at my house, I use a home-made Greyhooverman double bay (Copper) pointed towards the same exact transmitter as hers, and mine is about 15 miles further away! The low temps have absolutely no effect on mine though... that's why I'm thinking it's her Aluminum U4000 antenna. At first, I thought maybe it was interference from her Heat Pump unit since that would be running when it's cold, but it has no effect at all. I have already ran a dedicated circuit for the TV & converter box to try to illiminate any chance of iterference from something else on the same 120V circuit.