Jaybird,
In both my '04 and '07 Montys there was a coax that ran from the bedroom to the entertainment center in the living room. On both units I had to install another feed from the entertainment center to the outside in order to use two receivers. I have Dish and they have two satellites that have programing on each one, so I needed two feeds from my LNBs.
You may have to use a meter to identify which coax is from the bedroom.
I hope this at least gets you headed in the right direction. If you have further questions you can PM me with a phone number and I can call you if you like.
Dee
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