that's what parabolic reflectors are for, or other highly directional
antennas.  on the other hand, such a thing would be hazardous to other
drivers unless carefully used.  you could have it behind a plastic
grill, or in the trunk behind a radar transparent material and trigger
it when a "victim" is in the right direction.....  definitely not legal,
and definitely something you don't want to be arrested for, fun aside.

David VanHorn wrote:
>
> At 12:41 PM 6/15/2004 -0700, Shawn Wilton wrote:
>
> >That's pretty cool.  If it ever happened.
>
> Doubtful, except at very close range.
> Even with high antenna gain (17dB isn't unreasonable) the path loss is pretty high, and you might see a couple mW at the detector, which is probably sitting in 10-100mW normally.
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