I have a HVR-2250 card, and I just have basic analog cable. They also pipe in the local digital broadcast stations to the basic cable on ClearQAM, but two of them have always been unreliable (bad signal or no signal at all). Now for the past month those two channels no longer show up at all.

I had the idea of getting an antenna to pick them up over the air, but how can I hook up both the cable and an antenna to the card?