Some of us out here have gotten tired of Cobras causing ka or even k band falses on our "higher" end rds. My suggestion, use a Bushnell digital k band radar gun and slam them w/ k band radar. Make sure to do this so no accident is caused (carefully), but it is a way of getting back at a Cobra rd causing a false on whichever unit you may be running at that moment. Fight back at the Cobras. My $40 Bushnell has really come in handy.