I have the AM21 dual tuner connected to my HR23-700 HD DVR. The set up populated a list of local off air subchannels that are part of the directv channel lineup. The sub-channels record perfectly only when the TV(Sony Bravia with built in tuner) is turned on. I have tried leaving the AM21 and HR23 turned on but when I go to play the recorded programs from the list it goes to a black screen and the save or delete recording optionappears. The AM21 is connected to an antenna and has a good signal. Why would the TV have to be turned on to record these subchannels?? The only connection between the TV and the HR23 is a hdmi cable. The signal comes from the antenna and not the tv. I am very confused as to why it wont record and of the off-air channels with the tv turned off. Does anyone have any ideas?? Thanks