Putting Dish TV in my RV when I already have it in my home..

Find a local independent Dish contractor and pay him to come out and set you up. You will get some sort of tripod, a dish with associated hardware, coax cable all connected to your equipment. Once it is set up you will know how and what you need. Might cost you a few dollars more up front, but at the end of the day you will have everything you need without the hassles.