Shakespeare Style 396-1-AIS VHF Marine AIS4' LENGTH 3dB4' MAST MOUNT AIS ANTENNAThe 396-1-AIS has been specially designed to meet the broader bandwidth requirements of all popular AIS transceivers. Commercial-grade construction with a mast mounting sleeve.Brass and copper elementsSO-239 connector at the baseSuggested Mount: U-Bolts included. Can be strapped to a larger mast using steel banding (not supplied)One sectionCoax cable sold separatelyShakespeare Limited Warranty: 2 yearsTechnical Specifications:Frequency: VHF Marine Band Bandwidth within 2.0:1 SWR: 6.0 MHz SWR: 1.5:1 at 156.8 MHz Gain: 3dB Impedance (Ohms): 50 Gain: 3dB Max. Input (Watts): 100 DC Ground: no (will read open-circuit with ohmeter test) Termination: SO-239 at bottom of antenna Height (feet): 4 Polarization: Vertical Radiation pattern: Omni-directional