[mythtv-users] Comcast/Xfinity cable card

[DaveD]

I used to use Comcast's cable box's firewire to record but they stopped 
supporting that some time back.  We opted to rent one of their DVR's, 
but it sucks (got spoiled using MythTV!).  I had local channels working 
well with a dual antenna setup in the attic, but we had a new roof put 
on and signals all went to zero! (No, it's not a metal roof, just 
asphalt comp, but must have something in it the old roof didn't have).  
So, I'm thinking of dumping the Xfinity DVR and moving to a cable card.  
The Xfinity website says they "support" (meaning "allow") use of cable 
cards and have some example manufacturers, including HDHomeRun and 
Hauppauge.

Is anyone currently using a cable card (or other compatible device) with 
Xfinity and Linux?  If so, how is it working?  Are there multiple 
tuners?  Does Xfinity charge per tuner?  Advice?

Thanks,

Dave D.