Any asymmetry in the transmission/reception path will cause the IBOC
buzz to be heard. A badly tuned transmitter, tower, receiver IF
bandpass; anywhere in there.

Asymmetry it may be but judging from the overall broadcasting quality
I've heard in recent years it's going to be a real problem for many
stations to maintain. The expertise just isn't there. This poor soul
is expecting HD radio to save his job. He's so far from reality it's
laughable and apparently he doesn't really listen to his own stations
either.

jw