I have a similar living room/office scenario with DirecTV and these soluitions are starting to get complicated.

Do you -- 420 -- have existing in-wall cable wiring with jacks in each room? And, if so, would it be possible to take the coaxial from the DTV receiver, plug that into the exisiting cable wiring, and feed that through the entire residence?

(I am sure the answer is "no.")

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black