Until recently I was able to tune several hi-def channels from Xfinity using my "AVerMedia A188C PCIe Pure ATSC" card in my PC. Now Xfinity is scrambling the channels, so I got one of the Xfinity DTAs to unscramble them. But I am unable to tune my card to either channel 3 or 4 to obtain the output from the DTA. Is there a Hi-Def PC tuner card that I can manually tune to either channel 3 or 4 so it will work with the DTA?