http://www.stopiboc.com/howtocomplain.html
For station operators receiving harmful IBOC interference:
Don't be fatalistic.
DO NOT accept harmful interference as inevitable conesequences of the NAB's misfeasance and the political power of Big Group Radio. GET AN INTERFERENCE COMPLAINT ON FILE with the FCC. Get started on it right away! There IS something you can do to protect you, your employees, your listeners and your investment in your radio station!
For listeners and members of the general public:
You can submit FCC complaints through the Federal Communications Commission website, www.fcc.gov. While this "doesn't hurt," understand that the Commission doesn't accord a lot of weight to technical complaints filed by the general public…at least not until the number of complaints reach "a critical mass" and start to get the attention of the Mass Media Bureau and politicians close to the FCC.
IBOC-AM hasn't gotten there yet. But, given the abysmal performance of the system in the field, it's only a matter of time. So your complaint can help move this along.