I was wishing to just buy a used DP301 on EBAY to use in my RV camper parked at a campground in Madison Wisconsin. I am surrounded by trees,and probably couldnt get a signal,so my neighbor on the site next to me who already has a dishnet dish and splitter has offered to just let me hook up to his dish since its already there and I pay my own fees. He told me a used dp301 would be a good simple basic receiver. But on ebay I see many different ones. Some have yellow cards,some blue,some are referred to as REG 010,or REG 013. Some with MPEG,some with JTAG .Whats the difference in these,and can someone tell me what I need to get basic service and the recently available Madison local stations. He has a new style oval dish which he seemed to believe was needed to get these,since they replaced his 18" with it but not his receiver,when the locals became available. Which model DP301 and card do I need? Or will any of them work? Would like to keep cost to minumum,but see a wide range of prices for these 301s.