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Our current setup is two wires run through the walls to the 510, but only one is being used. Do you think we will need a switch, splitter?

Looking to change my 510 to a 722 and was wondering if i'm going to need the installer to climb on the roof near chimney. We currenly have snow on the roof. I know my outside dish is a twin dp and I get 110 and 119 sats. I'm looking for HD channels. I currently only watch one TV (But it's a big...