A small antenna with a 45 Mhz source and mixer at the center would retransmit a 
US
cellphone on its own receive frequency. Would that do what you want?

Cortland - KA5S

(What I write here is mine alone.
My employer does not
Concur, agree or else endorse
These words, their mood, or thought.)

Ken Javor wrote:

> Without a lot of test equipment that would be worth more than your car and
> that you wouldn't want to fuss with, the only practical way I can think of
> to quickly separate phone and ear in the car ahead of me is to send a burst
> of broadband noise aimed in the direction of the offending vehicle. I am
> thinking that 12 dBi gain would still be a relatively small Yagi or
> log-periodic from 850 - 900 MHz....


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