I have 3 radar detectors. I have 2 cars. My wife uses one and I use one. My 3 detectors are a passport 8500 x50 blue ver 6.3 M4 horn, a vector 955 ver 4.5 S7 horn and a whistler pro 78 Revision C. I live in Knightdale, NC a small city just outside of raleigh. Apparently, the Knightdale PD only use K band. There might be just 1 car that uses Ka but from what I've seen, every single knightdale police car has a k band radar. My question is, what 2 detectors out of the 3 should I use primarily? Thanks for your input.