wizzo, you don't have to broadcast to a satelite to be pickup. Just a relay near by like your cellular is good enough. Targetting specifics is also there. In japan, they have this system they can send you publicity directly to your cellular phone (like a 15% discount) about the store you are going be passing by next.
http://www.cnn.com/2000/TECH/computi...idg/index.html Hell, Some filters already work like that on the net, detecting nudity on images. (Ok, I admit they really suck, but it's there)
http://www.wired.com/news/technology...,36923,00.html
The technology is there, and this is scary.
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wiZd0m