i have the whistler pro 58 running in city 1 mode. When I get near this one location by a university, I get a K band alert. There is a gas station and a CVS pharmacy across the street as well as one of those crossing signals that chirps for the blind. Are any of these items causing the false? The same thing happens again a few miles down the road near a shopping center they are building. The signal strength is only a 4 in both locations.