You will not be able to listen to any police frequencies in Orange County, however on the fire side is wide open so once you program it it will work nicely. Orange County Fire Authority services the city of Irvine. OCFA, and MetroNet broadcasts are very strong county wide and I can monitor them in Riverside County. I purchased ARC 300 for my Pro 164 and ARC 160 to program my Pro 160. They worked very easily with Radio Reference and programming was very easy.