I am going to have an installer out on Sunday the 4th. I ordered the Platinum Hi Def package. What determines the model dish and what satellite it will be aimed at? The former owner of my house left a dish 500 on the roof. Will this be the one they use? Also, they are hooking up a hi def DVR to two tvs and two tvs on a standard piece of equipment. What receivers will they use? If it makes a difference, I am in Andover KS, 67002