Best radar defeater is the ol speedo combined with
the signs posting the speed limit. These two items
used in conjunction with each other work 99% of
the time regardless. Oh yea, one must use the ol noggin
also.

 

I've noticed people tend to drive in packs out on the highway. Never sit at the front. Stay a little behind the pack. If you're out in front of the pack you WILL get pulled over. Or if you really want to speed just hang back at the speed limit until some idiot in a BMW passes you. Then just pull in behind him and drive whatever speed he's going which should be plenty fast. That's your best protection against radar.
I've found this to be a surprisingly reliable method as there is ALWAYS some fool in a BMW or an SUV that seems think they've to the divine right to drive as fast as they want.