Take the question of spectral availability. While this might seem one of the easiest to settle-is more than half of US TV spectrum lying fallow or is it not?—the answer isn't obvious. The New America Foundation, a think tank that supports white space devices, claims that 25 to 80 percent of TV bandwidth is unused, depending on where you look. When the group hosted Google co-founder Larry Page at a DC event a few months back, Page also spoke of… more