I'd say that unless there's a "No Trespassing" sign up they can sit pretty much anywhere to shoot their radar at you. In your discovery part of the trial ask for a document stating where the cop was and compare it to where you were and go see if he was in violation of such a sign, in which case he was doing something illegal to get the reading and that might get it thrown out -- you can't start proceedings on wrongdoings if you yourself have done something wrong.
Also, during discovery request written certification of him checking the calibration with tuning forks. If they refuse and point to your ticket then bring up the issues you mentioned above. But first make use of the online posting of state law to make sure you're not in in the wrong on most of it.
Good luck.

