do you normally get the channel on your other TVs? If so, you'll just need to find the digital equivalent. This is assuming either your TV provider has it ClearQAM or you have the CableCard TV tuner for your HTPC.
Maybe the your TV Tuner card manufacture provides the digital channel. I know Silicondust does for the ClearQAM channels. They may have expanded for the QAM channels since they have a cablecard boxes now.