4' AIS MARINE ANTENNA WITH MALE FERRULE - DESIGNED TO NEET THE EXACTING AIS FREQUENCY REQUIREMENTS AND IN CONJUNCTION WITH THE USCG AUTOMATIC IDENTIFICATION SYSTEM (AIS) REQUIREMENTS FOR COMMERCIAL VESSELS - PROVIDES A LOW 1.5:1.0 SWR RATIO FROM 159-162 MHZ - THIS 4.5DB GAIN ANTENNA OFFERS UNSURPASSED DURABILITY AND PERFORMANCE AND IS COMPATIBLE WITH ALL AIS TRANSPONDERS - MADE IN THE USA; ASSEMBLED, TESTED AND TUNED BY HAND FOR SUPERIOR PERFORMANCE AND RELIABILITY - POWERFUL BRASS RADIATORS - SOLDERED CONNECTIONS - POWER DIRECTING FERRITE CHOKE BEAD - HIGH GLOSS URETHANE FINISH - 316 STAINLESS STEEL FERRULE - 4.5 DB GAIN - MOUNT: STAINLESS STEEL DOUBLE FEMALE FERRULE FOR MOUNTING 1"-14 THREADED BASE - CONNECTOR: QUALITY FEMALE SO-239 (UHF FEMALE) - CABLE NOT INCLUDED (USE VHF/AIS CABLES AND TWO DA645 CONNECTORS - DIGITAL ANTENNA 876-SW