We also have a lot of snow, but generally we don't have issues with snow on the satellite dish. We usually only have issues when there is sleet/freezing rain/wet sticky snow and thunderstorms. Also excessive wind can move the dish. We have our on the roof, but we also have a Directv satellite on a pole in the yard. Any of the above mentioned conditions can hinder satellite reception no matter if it is on the roof or on a pole in the ground.
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