OTOH
It would be better for TV watching if there was none of them.
"White space" is a misnomer. These are not empty spaces between channels.
Researchers from Microsoft have proposed running Wi-Fi in White Spaces, by slicing up the Wi-Fi signal into bundles small enough to fit between the broadcast TV channels. The proposal, termed Wi-Fi Narrow Channel (Wi-Fi NC), means reusing lots of Wi-Fi technology. But unlike those who want to just squeeze the existing wireless …
Indeed, I'm going to be a bit miffed in my fringe reception of a distant transmitter (in a distant region with other channels available) is messed up by a neighbour using this.
It's ridiculous how much spectrum lies totally unused and yet they squeeze all the stuff billions of people use into two small bands at 2.4 and 5 gigs, and now want to mess up the telly too! I despair at the human race, I really do :(
The other big Wireless Broadband technologies (EVDO, LTE for sure) have the ability to do "carrier aggregation" which operates pretty much how you describe. Take data traffic, and split it up to carry across the multiple carriers operating in different frequency spots. I think on the wired side it is called "bonding" where you glue a few pipes together to make one virtually larger pipe.