A button for TUNE and a Hold for ANT might suggest a post KPA500 Tuner with Antenna Switching. 73, Dick - KA5KKT ---------------------------------------------------------------------------- ------------ Here are a few Visalia 2010 photos of the P3 and KPA500 taken by Bo N7BK: http://pbckt.com/sQ.dJyP 73 and enjoy Tony VE3QF