Public safety has had to compete with commercial and other users of spectrum for a scarce resource, and increasing interference has been caused by heavy spectrum usage.

WHITEHOUSE: Testimony of Karen Evans

Arraycomm's approach allows the base station to constantly adapt the characteristics of the signal as the user moves around, keeping it focused, increasing spectrum efficiency and reducing interference from all the other signals permeating the air.

FORBES: Can Lightning Strike Twice?

The pilot will test the inter-operation of white spaces devices, white space databases and the processes to mitigate against causing any undue interference to current spectrum users.

ENGADGET: UK regulator wants white space wireless service in 2014, starts trials this fall