If your only trying to get service in the 1 room upstairs you might be able to use a Satellite Signal Booster/Amplifier.


It seems anything that can covert HDTV signal output to run over coax is very expensive. This thread on somethingawful has links to info on how to do it with older hardware. I also found this @ $799 dollars and only a preorder item it would be better to spend the money on rewiring the house.