I confess that it has been many months since I popped back into this site (or just a out any other such site on the Web). Other things have stolen my time, I guess. That being said, I decided to seek out the experts here because I'm baffled by a problem that began at least a month ago, if not earlier. Simply put, I lost ALL of my OTA channels on my two HD DVRs that were connected to an AM21. Each DVR is an HR24. Both DVRs check out OK; it's just that I get this nag on the screen on ALL my sub-channels: 771 - Signal loss on the off-air tuner... (792) I haven't don't anything to disrupt the signal—nothing moved or disconnected, no connections altered, etc. This just popped up on every single one of channels. Even a rescan did nothing to help fix the problem. It made me wonder if they killed the AM21. Did they do something to render that thing or anything else useless or inoperable? It's as if the OTA channels were all just unilaterally discontinued or something. Any thoughts?