The heavy duty system design supports the international shore based AIS & GMDSS automated safety service for broadcasted local and international meteorological warnings, navigational status and Maritime Safety Information (MSI). The swivel nut N239F is included for installation on ISO 228/1-G1 mounts. Radiating elements are made of brass. The antenna is manufactured using crimping technology giving the antenna a 4-5 times stronger build-up. The antenna has the same rugged design as all other AC Antennas products thus it withstands harsh environmental conditions, both on Sea and Land.