Topic: Police wire transmission distance?
Does anyone know how far a small police "wire" can transmit? I have a scene where someone riding in a car is wearing a small wire (ideally somewhere around the size of a tie clip), and I want the police to be able to listen in from another car following the first at a distance (e.g., a few hundred feet). There's no opportunity to add a powerful transmitter to the car being followed, so the wire has to be powerful enough to do the transmission by itself. I can increase the size of a wire somewhat, if needed, as long as it can be hidden in baggy clothing.
I've been unable to find any distance estimates online.