I wouldn't get too worried about hd radio as it looks as though there's not much demand for hd radio. Also it's really not HD but more like MP3's that have been compressed some more, in other words many stations quality will go down from bad. NPR stations seem to have high broadcasting standards but also are equipping with the Ibiquity towers. For home use there's a little available in some receivers tuner sections and no tuners that I'm aware that have been released for consumers and nobody seems eager to get them to market. Lots of hd towers have been bought and installed but they're just wasting electricity as most people don't know they exist and these same people seem happy with Sirius and XM radio. No doubt the radio stations who bought into this are wondering where are all of these new listeners that cost us so much money.
HD radio and old antennas
Does anyone know if old AM/FM antennas (like the ones made by Terk) will still work with HD radio? Some of Terk's products are listed as "digital ready" (not the ones I own) but I don't see any reason why the antenna technology would change.