I’ve been experimenting this week with my new SiliconDust HDHomeRun PRIME CableCard TV 3-Tuner HDHR3-CC (Black), which is a 3-tuner external device that hooks to my cable service and to my network.
It uses a M-type CableCard (from the cable company) to unlock and tune the digital signals. Then, any PC on my network can access any channel to which I subscribe. Cool.
Of course, it handles the non-High-Definition cable signals, too.