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" AIS Antennas4' Length, 4.5dB GainIn 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.All of our antennas are made in the USA, assembled, tested and tuned by hand for maximum performance, quality and durability.All 4' AIS Antennas Feature:\nPowerful brass radiators \n\nSoldered connections \n\nPower directing ferrite choke bead \n\nHigh gloss urethane finish \n\n316 stainless steel ferrule \n\n4.5dB gain \n800 GOLD Series\nMount: Stainless steel double female ferrule for mounting 114 threaded base \n\nConnector: Quality female SO-239 (UHF female) \n\nCable: Not included  use our VHF/AIS cables and two DA645 connectors \nThis product may not be returned to the original point of purchase.  Please contact the manufacturer directly with any issues or concerns. Specifications:\nAntenna Band: AIS\nColor: White\nConstruction: Fiberglass\nFerrule Type: Stainless Steel\nLength (Inches): 4'\nBox Dimensions: 2\"H x 2\"W x 50\"L WT: 3 lbs\nUPC: 839494001657\nQuick Guide (pdf)Owner's Manual (pdf)"
<https://diycustoms.store/products/digital-antenna-876-sw-4-ais-antenna-white-876-sw>