I have a dish and an aerial that goes to one TV.  Currently I have the dish connected to the TV under the house but don’t get every station.  I want to know if there is a joiner that I can get to connect both the dish and the aerial to the one TV.  I have been to Dick Smith and they have splitters but they split from the aerial to multiple TVs etc but don’t join both a dish and an aerial to one fitting under the house.  Do these joiners exist and if so where can I get one.