Throw a snowball at it. One hit will shake the snow offWe just had some wet, sticky snow, and the dish signal went out. So I tilted the dish to a vertical position and waited a few hours.
The dish is on the roof of a two story house and very difficult to get to in the winter, so for the past 25 years, when it snows a lot, we have to tilt the dish for a few hours, it always works.
I did come here to find a better solution. Maybe I'll try that snow & ice repellant next year.