Do a rescan on both sets. Since they share the same antenna it may be that the rig was in a different locale since a scan was done on it vs. the other TV. They "remember" only what was programmed from the last scan. This assumes that both are properly connected to the antenna of course...you'd know right away if they weren't. Yep, do a manual rescan, sometimes referred to auto scan and usually done via the remote control via the on screen menu. Welcome to the wonderful world of digital TV! -Bill, Transmitter supervisor, WIS TV in Columbia, SC.