Members of the ARRL may wish to take a look at Figure 1 on Page 33 of their July 2008 QST Magazine.
This figure is a screenshot of the AM spectrum between 824kHz and 868kHz. It was shot near Atlanta in the morning. The shot clearly shows the signals of WTRU-830, WHAS-840, and unID stations on 850 and 860. It also shows WHAS's IBOC sidebands directly adjacent to the carriers of WTRU and the 850 station.