"Guerite©" wrote in message
...

and with only 60% the coverage of analog.

Using 1/100th the power of the equivelent analog's signal carrier. Thus a
power savings to the station.


And, as discussed, on FM the "used" coverage area is the 64 dbu curve. Over
80% of listening is in the 70 dbu, and the rest in the 64 to 69 dbu contour.

The HD signal at least matches the 64 dbu useful and used contour. On AM,
the HD signal is often listenable beyond the "used and useful" contour of
the analog signal.