Right now we have a RCA Satellite system that is first generation. We want to upgrade to a newer dish that supports multiple DtrecTV Satellites with up to 4 receivers. My question is will our current receivers work with another brand of dish? We have 2 RCA receivers that we'd like to keep and simply change the dish and add 2 more receivers to. The one we are looking at is a Hughes but will the RCA Receivers work with the Hughes Dish or do we need the same brand receiver as the dish?