I have a great TV set. It is a very new Sony HDTV. But, every day I keep trying to program it and I'm only picking up one digital channel and the one remaining analog (very weak) channel that has been left explaining the transition. I would assume that the TV has a built in antenna. Can anyone advise me on this? Is buying an external antenna the only way to get any sort of free channels without having to feed the WAY overpriced cable/satellite giants?