If the problems are with UHF signals that should be of adequate strength and when the wind blows, the underlying problem is always due to trees.
The only 100% reliable solution to tree-related reception issues includes the word "move" - as in the move the antenna, move the offending tree, or pick up and move to a new location without the trees. While once can nibble around the edges of the problem with amps, different type/style of antenna, or similar measures that can offer some improvement, none are assured of solving the problem.
This is not a new phenomenon, it was also an issue back in the analog days although the manifested symptoms were different. With analog, such signal impairments usually manifested as snowy video, ghosting, rolling or tearing video, loss of audio or color, etc. An interesting read from an antenna installer in the UK describes his experiences in this archived article from 1990:
http://www.wrightsaerials.tv/referen...-reception.pdf Another article by the same guy in 2010 reiterated the issue for digital:
http://www.wrightsaerials.tv/articles/whatsat-trees.pdf