Comment Stupidest idea ever (Score 4, Informative) 121
(Disclaimer, I work for a broadcaster in Australia, so take this with a grain of salt)
OK for starters the bit about "consistent speed no matter how many users there were" is complete garbage, with ANY radio based system data system.
Secondly, if you start using the TV spectrum for data in both directions, you start putting a really strong signal OUT your TV antenna, which despite being on a different frequency to the actual TV channels, it is close enough to swamp the (really weak by several orders of magnitude) TV signal on the next band with the (extremely strong in comparison) outgoing signal.
So you can forget about watching TV while you're using the internet.
The decision to sell the TV bandwidth rather than just keep it for the public use (eg. super HD TV, or super multichanneling or whatever is in the future) is completely about $$$$ and greed by the Federal Govt so they can sell the bandwidth to the highest bidder.
Grrr.