Jeff, I believe Ed is correct. 143.975 FM is a Civil Air Patrol freq usually used by aircraft when they are on patrols. The MD CAP Wings do quite a bit of patrolling, especially over the Chesapeake Bay as part of their mission looking for oil spills, pollution, etc. RON ANNE ARUNDEL COUNTY, MD (NEAR BWI) Pro-2045/BC-895XLT w/Discone