"Nearly every market in the United States has empty white spaces," said Ben Scott, the policy director of the Free Press. "In some communities, more than three-quarters of the broadcast spectrum is unused. Unlicensed devices make efficient use of the airwaves because they're low-power and smart enough to detect and avoid other broadcasters and services."

Jake Scott, a spokesman for the Wireless Innovation Alliance, echoed Ben Scott's remarks and said that he expected the FCC's final report to validate "the feasibility and safety of white spaces technology."