Digital Antenna 578-SW 4' AIS Antenna Marine Monitors 9″ Surface Mount Base

9″ Surface Mount Base

Available in two shaft lengths: 1

50 cal 250 grain smackdown and (15)

then a centreoff two pole changeover switch can be used

Digital Antenna 578-SW 4' AIS Antenna Marine Monitors 9″ Surface Mount BaseAIS Antennas 4' Length, 4. 5dB Gain In conjunction with the USCG Automatic Identification System (AIS) requirements for commercial vessels, Digital Antenna created a series of 4 AIS antennas that meet the exacting AIS frequency requirements. Designed with a low 1. 5: 1. 0 SWR ratio from 159 162 MHz, Digital Antennas 4. 5 dB gain AIS antennas offer unsurpassed durability and performance compatible with all AIS transponders. Customers and installers