At the moment, I have everything set up with HD to the upstairs room. I definitely had to switch back to the unpowered multiswitch, though.

Unfortunately, I can't get the second line working. It doesn't make any sense, though. In the room, it's one of those 2 coax cables stuck together, you know? Where you can separate the two by pulling on them? What's that called?

Anyway, in the basement I know exactly where one of that pair comes out, and it still has the other connected to it, but even with the other cable in the pair connected right next to the good one, and yet to the receiver, it's as though there's nothing there. Any ideas?