The mother of all antenna couplers: Harris RF-601A. – TF3XO
Harris Fast Tune Automatic Antenna Antenna RF Communications, | Radiomuseum
RF-382 Series Fast Tune Automatic 500 Watt Antenna Coupler
HARRIS RF-281 AUTOMATIC ANTENNA COUPLER AND RF-339 COUPLER CONTROL UNIT Service Manual download, schematics, eeprom, repair info for electronics experts