There is ZERO need for this technology. But for Google it's better than their Illegal deliberate WiFi Slurp. One end at least of every so called "White Space" deployment has to periodically report where it is and get channel to use from the Database.
Of course Google is offering to run the Database for free. Can't you see that so called "White Space" Radio is simply a corporate ploy to legitimately "spy" on Consumers? It's 100% proven years ago that that it will interfere with some users. Databases and Reception monitoring are not accurate enough.
Also the capacity and speed is actually poor compared with systems running at more than 1GHz. Try proposing this on 3G or 4G or GSM "White Space" channels and see how far you get. The fact is FCC & Ofcom care about phone operators and don't much care about protection of Spectrum for Broadcast Reception users, because Mobile Operators raise them more money.
The allegedly unused TV spectrum is no more unused that a Mobile Phone Channel you don't see used. Look up "Hidden Transmitter Syndrome"
Consider people in Fringe Reception or blocked from "local" TV transmitter by a local building, trees or hill and receiving from a more distant Transmitter. Google's Database won't be good enough to consider it.
Also it has been made HARDER in most countries for viewers to complain about Interference and on Digital TV it's not obvious till it pixelates or freezes (the Digital Cliff).
The ONLY people supporting this are people that either know nothing about RF systems or deliberately dishonest Corporates or Bean Counters in the Regulators.