I live in Oklahoma, and have a 722 reciever. I work in the DFW area, and live down there while I am working. While I am working in the oilfield, I live in a large travel trailer. I have a 32 inch LCD tv in my trailer, and have ordered an 811 HD reciever to add to my account so I can use it while I am down at work. While I am at home, I will put the 811 in our guest room. My question is,..... what dish do I need in the DFW area to get all my channels plus the HD channels? Can I just use one of my old Dish500s? Or do I need to get one these 3lnb dishes that I have on my house now? Thanks in advance for the help.