Used in great condition, GARMIN GA56A GPS antenna. PN 011-01154-00, SN 4390 0269. This antenna was removed from a GNS480 installation for a later style WAAS upgrade to a GA35 antenna. TSO"d C-144. This antenna is very rare, it was first used by the Apollo CNX80 as one step up from the original A33 GPS antenna. This antenna has been tested and operates properly. This antenna comes with a rubber mounting gasket.