http://www.radarsource.com/cobra-faq.htmOriginally posted by RadarSource.Com:
Where should I mount my radar detector for maximum efficiency?
Mount your radar detector in an area with an unobstructed view of the road ahead, and if equipped with a 360? Laser eye, a clear unobstructed view of the front, side and rear windows. Please note that vehicles such as vans without rear windows will not allow reception of the laser signal from the rear of the vehicle. For maximum efficiency do not mount the radar detector high up in the blue tinted area of the window or low down behind the windshield wipers as both of these areas will interfere with reception of radar and laser signals.
For best operation it is recommend to mount the detector as low as possible at the windshield (while avoiding obstructions). It is also important that you mount the unit in a position where you can quickly view the display screen while not obstructing your view of the road ahead.
This is a manufacturer FAQ off the site above. This is where they recommend it, so it's where I put it. I used to have my old Whistler (really good detector, btw, too bad my friend that borrowed it while I didn't have my car broke it  ) mounted right below the rear-view mirror on my old Grand Prix, didn't notice a difference between up there and right above the wipers on my Contour...
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