The ice and snow combined to block the signal, this happened several times last winter. It was to slippery to get to my dish, to clean it off. The dish was mounted on my fence 8 or 9 feet off the ground.
The front roof of our house is pretty flat, almost too flat for shingles. That side of the house is 400'+ from the street, so I keep a ladder up there on a semi-permanent basis, because I have to clean the wood stove flue several times each winter, and, of course, gutter cleaning and other chores. The snow wouldn't be so bad, although that would have been one more path I would have had to shovel out. The last really bad ice storm we had, Xmas of '98, I had to go up to set a tarp, since a red oak had plunged through the roof. That was about 1" of ice and that was no fun. I've about decided that I might make it without too much tree cutting, if I back the dish all the way back to the east end of the house, to expose as much sky as possible. Maybe then I can get over those trees, or, maybe, just cut the cherry which needs to come down anyway...