First, as wagon217 says, it may also help if we knew what kind of in-motion dome you have and what receiver you are trying to use with it. I may be wrong, but I think you want to be set for 18" round with any dome.
Second, I would call Tiffin to find out how the dome is set up from the factory. It may be set for Dish Network, and you're trying to use it with DirecTV. Both of those companies use different satellites, and the system needs to know which one to look for. You could also look through the stack of manuals you got with your coach. There should be one in there for the dome that will tell you how to change it from Dish to Direct and vice versa.
Third, you may want to ask the moderators to move this question over to the Technology section where someone like Bill Adams is more likely to see it. Bill and several others over there are very knowledgeable on anything having to do with satellite TV.
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