As I best understand HD radio, the signals are cleaner without hiss. Also, there can be more than one channel on a frequency. So, your local PBS may be broadcasting three programs on their regular frequency.
To my old ears the HD sounds much better. Yes, even on this what many would call an inexpensive radio. Actually, Amazon has this listed for about $90 (through another seller).
There are about 30 FM and one AM HD stations in my area. And, no, this radio only tunes to FM stations.
Take a look here for all of the information about HD radio.
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