My HR20-100 (in service since Sept 07) has lost the ability to see any OTA channels. I really do not know when this happened, but since D* is in "negotiations" w/ my local CBS, I thought I would take out the old antenna and set it up in case the negotiations failed. I have tried re-doing the Antenna setup, but this did not help at all? Any suggestions? If I call under the protection plan, could I just have them send me an AM-21 to be used with my HR21 or HR24?