http://www.stopiboc.com/index.html
End The Radio Engineering Scourge That Could Mean Doom To AM Radio
A hybrid digital/analog broadcasting system has been pushed through a perfunctory FCC approval process, by the developer working in concert with the National Association of Broadcasters and large corporate radio groups to benefit a few big-market Am radio stations.
Not only does "In-Band", On-Channel" hybrid/analog AM radio not work well - it generates harmful interference which could end AM radio listening as it has existed since 1920.