Here is the current status: R15 in legacy port: fully functional HR20-100: All channels that I can tell so far except 212 NFLHD. HR21-700 in living room: Nothing, signal meters show ZERO. HR21-700 in son's bedroom: Same as HR20-100, all channels that I can tell except 212HD. H21-200 (HD only, on DVR): Nothing, signal meters show ZERO. HR20-700: No idea, turns out the box is dead.