Below is a link to a story in the trade journal Radio World:
http://www.rwonline.com/article/proponents-want-uneven-fm-sideband-power-approved-quickly/211546Apparently this is a shift in power between sidebands rather than an increase in total power. The result would be more stations getting permission to raise their HD power. Ibiquity (the company behind HD Radio) and NPR say this would do no harm.
Please email me if you want details on the FCC process or the procedure they have established for complaints about interference with analog signals. I don't work for the FCC or the broadcasting industry; all I can do is lead you to public documents.
