"Bob Radil" wrote in message
...
... and creates significant adjacent channel interference
problems. For the latter reason, its use is forbidden at night.

And likewise, it should be forbidden for daytime use also since important
componants of the signal are outside of the defined bandwidth. If all
stations
go IBOC then the mutual interferance will severely reduce the coverage
areas of
all stations, even the 50KWs.

Most stations don't care today about anything except their home metro
groundwave coverage. Any damage in the secondary or skywave coverage areas
is irrelevant.