The following description is true, honest. Have a 622 at L710 and a 722K at L750. Each has its own Digital antenna connected to the Over The Air port (OTA). I use the antennas to view & record local sub-channels - mainliy, 18.2 in Los Angeles area. Been working fine since the cutover to digital from analog a couple of years ago. Usually has signal strength in the low-to mid 70% Abut a week ago, I discovered that both receivers are unable to display 18.2 and several other other local sub-channels. I get the yellow "complete signal loss " screen . But, and this is the unbelievable part, each receiver successfully records a scheduled program from 18.2 and others. No signal distortions or dropouts. I don't know how long its been occuring. Only reason I discovered it was when I went to view a sub-channel during the day, instead of recording it. Since scheduled recordings are successful, I have not switched the antenna to the TV's to see if the problem moves - too lazy to get their manuals out and do a channel scan. Grasping at straws, I have re-scanned the channels on the two Dish receivers, but it made no difference.