BRP is on p25 conventional,rumor is and fact of monitering,theyve been testing encryption for the past year and plan to go fully encrypted...so,youll need a frequency counter with sensitivity adjustment to tell when they are nearby....BRP FREQS input freq utilizes all IN range repeaters and simulcasts on multiple repeaters at once..thus why you can hear all radio traffic the entire length of the pkwy..A Truly Superior Radio System....