A clever solution for keeping snow and ice buildup off your satellite dish is to put a plastic trash bag over it and pull it tight to prevent sagging.
Use duct tape to seal the bag to the back of the dish. The snow and ice will fall off the bag and give you clear reception.
If snow and ice starts to build up on the bag, spray the bag with PAM (or similar) cooking spray.
Satellite dish heaters and covers are available but you can’t beat the price of the remedy outlined above.