My info is pre computer,so do a web search. Scanner World USA (10 New Scotland Avenue, Albany New York 12208) has an excellent selection of radios, and most important; accessory antannae and directories. Make sure you get a unit with both AC and DC power for use in home and car. A programmable feature will let you key onto weather,marineband and local agencies immediately. Laws vary from state to state regarding their use, so check first.The Betty Bearcat directory is full of innacurate information.<br><br>