TV cards

In relation to MythTV or Freevo, say I get a Hauppage PVR-150, http://www.spoofee.com/forums/showthread.php?t=30751 , now $59 after rebate...the "125-channel cable-ready tuner" doesn't allow you to get the upper channels that you get thru digital cable. Mine goes to some large number though I don't have them all, but specifically HBO resides in the 300-312 range. Will one of these allow you to get the digital cable channels without being connected to a cable box and how do you get the upper channels?