All use of wireless microphones on former Channels 52-69 must cease on June 12, 2010. These channels were auctioned off in 2008 as part of the transition to digital television, and will be used for public safety and commercial services incompatible with wireless microphone use. More details here: http://hraunfoss.fcc.gov/edocs_public/attachmatch/DOC-298506A1.pdf