Not that they've actually solved the problem, but...
After a wait of roughly 14 months after the FCC’s Second Report and Order on White Spaces, the agency has finally issued a firm date for the cessation of wireless microphone systems in the 700MHz band that has been reallocated to new licensees. In essence, the use of any wireless mic, in-ear or communications system in the 698MHz-806MHz range will become illegal as of June 12, 2010, exactly one year after the DTV transition occurred. Users of systems that operate in the 700MHz band are required to retire them by that date.
http://broadcastengineering.com/audio/fcc-order-finalizes-ban-rf-mics-700mhz-range-0120/