In the past couple of years, the US has set the pace in seeking new sources of wireless broadband spectrum, and proposing creative ways to harness and share them. None of this comes without controversy, however, as seen last week in two areas where the US has pioneered flexible spectrum sharing – the 3.5 GHz CBRS (Citizens’ Broadband Radio Service) band, and the TV white spaces (TVWS). The latter has not lived up to the high expectations which supporters like Google and Microsoft raised, when the FCC became the first regulator in the world, in 2008, to open up the fragmented spaces in the TV bands for open wireless use. The amount of spectrum available varied greatly between different locations,…