What's the deal with some stations switching back to high band VHF from UHF? ABC back to channel 7 in New York and L.A., as well as others? Wasn't DTV supposed to be entirely in the UHF spectrum? And they told everyone that they were going to need UHF antennas? And now some stations have gone back to VHF and some people who bought UHF only antennas because of what they were told lost reception and have to buy new antennas again? What is the reason for this mess and why have some stations moved their digital signals back to VHF? Maybe someone could explain the history and reasons here, or point me in the right direction to understand what happened?