To everyone thinking that safety will depend on the TV transmitters being always on, this is likely to replace only *one* of the types of radar, primary radar (where you send out a signal and look for reflections). SSR (secondary surveillance radar) won't be going away. This type of radar sends out a signal and the aircraft actively replies.
Primary radar is used to paint targets that don't have transponders. What the CAA has been angling to do for a while now is make Mode-S transponders mandatory in control
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/QZIQlLlVrVo/story01.htm
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