Meet the Digital 578SW 4ft AIS Antenna—built to meet USCG AIS requirements for commercial vessels with unmatched durability, performance, and a streamlined installation that installers and operators trust.

• Precise AIS performance with a low SWR of 1.5:1 across 159–162 MHz and a strong 4.5 dB gain, ensuring clear, reliable transmission and reception in critical AIS channels.
• 500 GOLD Series with an easy installation connector system—the gold factory-attached mini-UHF female connector pairs with a PL-259 adapter, allowing solder-free connections to AIS transponders.
• Standard 1"-14 threaded base for versatile mounting on a wide range of vessels and configurations.
• Rugged, marine-grade build featuring powerful brass radiators, soldered connections, a ferrite choke bead for power direction, a high-gloss urethane finish, and a 316 stainless steel ferrule for long-lasting durability.
• Flexible, high-quality cabling with 25' of low-loss, tinned braid, foil-shielded, UV-stable RG-8X marine cable to reduce signal loss and stand up to harsh marine environments.
• Made in the USA—assembled, tested, and hand-tuned for maximum performance, quality, and reliability.

Designed to work with all AIS transponders, the Digital 578SW 4ft AIS Antenna delivers dependable, marine-grade performance when every signal matters—whether you’re navigating busy waterways or complying with regulatory AIS requirements.