AM HD Radio 24 x7 as of September 14, 2007

http://www.popularwireless.com/blog1/2007/09/22/hd-radio-24-x7-as-of-september-14-2007/

In March of this year the Federal Communications Commission authorized AM HD radio stations to begin twenty-four-hour per day broadcasting on September 14, 2007. This is a major shift in the FCC Rules that formerly protected broadcasters against the expected and now prevalent nighttime interference to stations on channels adjoining an HD broadcaster.