How do I install a sattelite dish on a caravan.?

I am a caravan and love it! but 1 thing always gets me annoyed. TV AERIALS not 1 tv aerial i have had before the analogue signal was switched off, As I live in scotland and go to sites which are in the glans and valleys and lochs etc, anyone know which aerial or dish to get that will give me BBC 1 at least? I have tried all the types and had/have signal boosters but nope nothing this weekend in Ballater Royal Deeside. Doing my head in now and just want to get it working at least once so can be able to say , YAY we done it!..... any help well accepted , cheers