If you want to watch Live Cable TV in your den, you're going to need a set top box in there. I think only the first two are free, so if you need a third, you have to pay the monthly fee for its use. In a little over a year, you'd have given Comcast more money than the cost of the HDHomeRun Prime. I had my Ceton InfiniTV4 TV Tuner Card (and Comcast) for a little over seven years before it died.
As for why they seem to be out of stock everywhere, given various TV Apps and OnDemand programming, there's not much call for TV Tuner Cards anymore, so manufacturers have stopped making them.
Cablecards are small cards that plug into your cablecard ready device; either a TV or a TV Tuner device like the HDHomeRun Prime or Ceton InfniTV4. They provide communications and decryption of the signal being set from your cable company. No set top box required.
Your run of the mill TV Tuner cards will typically have one or more types of tuners:
- NTSC for Free Over-The-Air analog broadcasts (now defunct)
- ATSC for Free Over-The-Air digital broadcasts
- QAM for unencrypted cable broadcasts
I would note that most cable channels are encrypted these days. Devices like the Silicon Dust HDHomeRun Prime, Ceton InfiniTV devices and Hauppauge WinTV-DCR-2650 can use cablecards (from your cable provider) to do the decryption of those encrypted channels. If you only need one or two set top boxes with DVR at home, then it's not really worth it. Otherwise, it's a good investment.
-Wolf sends