Won't work. The computer is dedicated to engine management.

I should clarify. I have _built_ a computer into my car. It currently
plays MP3s, does GPS navigation, movies, etc. In fact, it's hooked to
the onboard engine management computer as well so I can view real time
engine status and troubleshoot problems.

Regarding using a 4 antenna system as mentioned in an earlier message,
would that really give me fine enough resolution to detect where a
signal was coming from within say 20 degrees? Or would it be in 90
degree increments?