The issue is typically water or snow on the actual surface of the dish and not in the atmosphere - the best plan when lightening is not present is to send either you kid or your spouse out with an umbrella to shield the dish surface - that's why you have a family anyway, isn't it!
Used to work great when dealing with the old rabbit ear antennas - they can take a break during the commercials so it isn't all that arduous!
3.5 hour football games are a little harder, but they will build up stamina with lots of practice!