I had to get a new TV because my old TV would not pick up the signal from the antenna at the new house. Seems they changed the air broadcast format from analog to digital signal and my TV was made too long ago, before the change. So I got one of those new fangled flat screen TV's, actually it's used, but new to me. It recieves the digital signal and I can watch TV :).
Later I found a digital to analog converter at Radio Shack and hooked it up to the old TV. It works, but the signal is very weak after going through the converter box. It hardly gets any channels. Seems I should have bought the signal amplifier box they were selling right next to the converter box. :(