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AM Stations' Distant Listeners Hear Static
The Wall Street Journal highlights a side-effect of digital AM using HD Radio: More distant listeners who used to get a clear analog AM signal now experience fuzz and his from adjacent broadcasters who have added HD Radio. This doesn't bother the FCC because the interference isn't heard in core areas, this article notes. But it does reduce listenership.
This article also notes that an anti-trust lawsuit has been filed by Leonard Kahn against iBiquity and Clear Channel because the only FCC-approved digital AM/FM technology is controlled by iBiquity which has a set of investors that include major radio firms like Clear Channel.