auctioned in March 2008; bidders got full use after the transition to digital TV was completed on June 12, 2009 (formerly UHF TV channels 52–69). T-Mobile USA, licensee of "block A" (channels 52 and 57), began using its frequency allotment in 2015, in media markets where TV stations on 51 either did not exist or relocated early. 614–698MHz (TV channels 38–51) will be auctioned in March 2016. References Radio spectrum Broadcast engineering