The new UB UHF wireless band is comprised of 100 channels between old UHF TV Channels 51 and 54...that's 693 to 716 mHz. This adds to the UA and UC bands already working making a total of 32 possible wireless systems able to operate interference-free at a single venue. UB band cost nothing extra with your Shure system, just specify when ordering. You can also have your current UC band system converted to UB at a small cost at Shure Service Departments.