The device they can use is called a multiplxer. What it does is allow for the usage of the existing cable running from comcast into the wall outlets in your house. They need one for the dish and then one for each room TV. It acts like a splitter as it seperates cable/internet signals and uses 2 wires. One goes to your Directv receiver and the other to a comcast receiver be it cable TV or internet.
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Philly,Colorado Springs, Yardley,Pa. Mt. Laurel, NJ. Palm Desert,CA.Scotsdale, AZ. Ocean City,NJ
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