There Has Been An Error!
With something that can broadcast in that range, you can take the stream from one camera and use it to jam the stream of an entirely different camera.
Or, you can use it to do this: http://www.youtube.com/watch?v=tWdgAMYjYSs
Lol, upload creepy images so that night-shift guards freak out
In my city, there is a cable channel that shows the various traffic cams around the city (sometimes, not all the time, mostly in the morning, I think). They also have a webpage so you can watch over the internets.
It would be cool to hack them somehow and superimpose Godzilla or some thing.