I'm a new PSR500 user (just got the unit this afternoon). I have a question. We're in a metropolitan area of South Carolina that uses a state-wide Motorola trunking system. One of the towers has its own set of control channels and transmits traffic for one county (and others as well). Another tower within range uses another set of control channels and transmits traffic for the other metro county (and other traffic). I want to be able to listen to traffic from both towers at once. Should I set up my scanner as "stationary" while, of course, entering the control and alternate frequencies for both towers? Or, should I simply leave the setting as "Off"? Thanks for the help and I feel sure they'll be other questions that I can't find the answers for.