I'm not currently using an antenna, I've got cable service. My tuner card has 2 built in tuners, one for ATSC and the other is (not sure what it is called) for just any input. If i put a coax cable in the atsc input it will find a few channels, if i put in the cable input to it i cant get any digital channels (not really sure why, my TV only has 1 input and gets both digital and standard).Since i've disabled the ATSC tuner my tv is working fine, hopefully an antenna will help