Comment Re:Location (Score 1) 560
Well, it does, actually. If you intercept a signal, you absorb part of it, so you are changing the electromagnetic field. If you are changing the electromagnetic field, you can be tracked (in principle). Of course you're not going to track a portable radio for reasons of practicality, but that's an issue of scale, and not something fundamentally inherent to the theory.
In some circles it goes by the name of radar :)