I'm thinking of getting one of these for my HTPC. Can someone tell me if the TV signal (RF) is still "passed through" the card even whe the PC is powered off? Reason I ask is that our aerial comes into the lounge (through iPlayer, Sky and DVD recorder) before going off round the rest of the house. I want to add the DigiTV in at this point, but it's important that everything else still works even when the PC is off. Thanks, Rob.