I've just upgraded my Directv to HiDef. An installer put up the dish and antenna. The HD is incredible on my Mitsubishi 55807, the problem is that the sound drops out under certain circumstances. When switching to or from one channel to the HBO hi def channel the sound drops out and I have to re-select TV/DBS on the Denon to get it to kick back in. Just watching the local station digital channel starts out fine, then the sound drops out every 5 minutes or so. I don't get the overload light on the Denon, but I do notice the red "Digital" indicator goes out, then comes back on, with the sound, when I re-select TV/DBS. Does anyone know if this is the Denon or the Antenna? or Mitsubishi receiver??? I love the HD. Love the sound when I can hear it, and love the TV. I need to solve this sound thing though, it's not tolerable. I appreciate any help.