tried moving your antenna??
1: the channel is not broadcast in digital yet
2: you have the wrong antenna for your area to get digital
3: you have the antenna in the wrong place or pointed in the wrong direction
4: your gain is too low
5: your cable is bad or not shielded
this will help you with 1, 2 & 3
what is the signal strength your getting???
4: shorten your cable length, if it is 50ft+ long, look at getting a power antenna or amp
5: if you have one of those thin/flat coxal lines for running under a window & screen, so you can close it. GET RIDE OF IT!!! I had that problem with my set-up. There unshielded and just make problems for picking up digital
90% loss of channels after installing the digital converter box:
NO SIGNAL seems to be the new fad in TV land!