Was heading back from the airport tonight and while on the 440 my x50 suddenly alerted to a weak Ka signal which disappeared, then returned a moment later, then disappeared again. This activity continued for about 1.5 miles on the straight away until I saw a NC state trooper in the median facing oncoming traffic with his lights off. Of course, I was at the PSL. Had been for some time. I have the detector mounted in the middle of the windshield. I wonder if a higher mount would have provided even more range in this situation. Still, I was very happy with the 1.5 mile warning on that IO Ka.