Ok this is a strange one. I have an HR20-700 (since Jan 07) and have always had rock solid off the air antenna reception on all channels until last night. I tuned to the local ABC station and got the "searching for signal message on off air tuner... 771". I checked the other channels and all are coming in fine. So I check the signal strength and am showing 84 for ABC on tuner 1 and NOTHING on tuner 2! All other channels have similar signal strength on both tuners. Any ideas why this is happening on this one off air channel?