I don't think it is safe to assume that the OP already has DISH.Or you can tell by looking at the dish. Western Arc has three equally (or close) spaced LNB heads. Eastern Arc has two together and one further spaced.
Out of curiousity, why do you want/need to know this?greglwood said:How can i tell which arc my dish is? Or is there a way to lookup which i should have based on location?
He/she asked "which arc my dish is". Pretty sure that indicates they already have Dish.I don't think it is safe to assume that the OP already has DISH.