Here's a recent encounter i had with the X50:
Last Friday on the way to work through Coppell, Texas. Came to a four-way intersection on a red light. Right as i approached, the X50 received several ka beeps, then stopped. Light turns green heading east, another beep, then nothing. This continued with intermittent 1-2 beeps. A mile later, the road took a bend heading south, with random ka warnings increasing. The road then bends heading southeast. As i approached Hwy 121 there sat a motorcyle LEO with his rear to my front, having pulled someone over for speeding. He was walking back to their car with ticket in hand. Seems to me the gun was in "idle" mode or however you might describe it. I drive this route every day, just to realize how the X50 picked up the radar gun from 2 miles away, while not even in use.
I drove the same route this morning, and measured the distance. Exactly 2 miles. On a normal day, with no LEO's present, there's no false alarms down the same stretch of road.
I'm totally impressed with the performance of this unit.
Tried to copy/paste mapquest, showing the exact distance for this route from that intersection to Hwy 121, but it wouldn't let me paste it.