My Idea was to get a cigarette lighter power extension cord, and then run the wire from the side of the windshield all the way to the top of the rear view. Here, at first glance I imagine it wouldn't be noticeable.
that's exactly what I've done with the Passport 9500 and you really can't see it. Not perfect but I live in the only state in the country where radar detectors are STILL illegal. Every once in a while you need to be able to take it down from the dash. Easy to stick in the center console when parking somewhere.