I plan to put my direct tv receiver in my rv. There is a 3 LNB dish on my roof, so does this mean I need to get one like that to go on my rv? Don't really understand why there are 3, but I would like to receive the same channels in my rv that I get in my house. Perhaps this is asking too much. Can someone please enlighten me before I go and buy the wrong thing. My local provider wants $129 for a dish and tripod for my rv so don't plan to do that. I saw a really neat way to anchor the dish using a heavy umbrella stand, and wonder if anyone else thinks this is a good idea as well.