I know the headline of this link sounds esoteric and boring, but this is actually a fascinating story from David Zweig in Wired:
Random Farms, and tens of thousands of other theater companies, schools, churches, broadcasters, and myriad other interests across the country, need to buy new wireless microphones. The majority of professional wireless audio gear in America is about to become obsolete, and illegal to operate. The story of how we got to this strange point involves politics, business, science, and, of course, money.
The upheaval around wireless mics can be traced to the National Broadband Plan of 2010, where, on the direction of Congress, the FCC declared broadband “a foundation for economic growth, job creation, global competitiveness and a better way of life.” Two years later, in a bill best known for cutting payroll taxes, Congress authorized the FCC to auction off additional spectrum for broadband communications. In 2014, the FCC determined it would use the 600 MHz band — where most wireless microphones operate — to accomplish that goal.
According to Zweig, this is the second time in ten years that part of the RF spectrum used for wireless audio equipment has been reallocated; so, for many users, this is the second time in recent memory they’re having to spend thousands of dollars on new gear. And there appears to be no indication that the FCC will cordon off a specific spectrum for these kinds of devices to operate on, which is foolish.