Digital Antenna 578-SB 4' Marine AIS Antenna 4.5dB Gain with 25' Cable Black

The Digital Antenna 578-SB is a professional-grade 4-foot marine AIS antenna designed to meet USCG Automatic Identification System requirements for commercial vessels. This high-performance antenna delivers 4.5dB gain and features an exceptionally low 1.5:1.0 SWR ratio across the 159-162 MHz AIS frequency range, ensuring reliable communication with all AIS transponders.

Premium Construction Features:

• Powerful brass radiators for superior signal transmission
• Soldered connections for maximum reliability
• Power-directing ferrite choke bead to minimize interference
• High-gloss urethane finish for weather protection
• 316 stainless steel ferrule for corrosion resistance
• 4.5dB gain for extended range performance

500 GOLD Series Specifications:

• Standard 1-14 threaded base mount for easy installation
• Gold factory-attached mini-UHF female connector with PL-259 (UHF) adapter
• Includes 25 feet of premium low-loss RG-8X marine cable with tinned braid, foil shielding, and UV-stable jacket
• No soldering required - connector system ensures quick, reliable installation

Proudly made in the USA, each antenna is hand-assembled, tested, and tuned to deliver maximum performance and durability in demanding marine environments. The convenient plug-and-play connector system eliminates installation complexity while maintaining professional-grade signal quality.