Shakespeare 4ft Phase III Antenna AIS. The ethafoam spacer system and silver-plated elements enhance the antenna's technical performance and longevity to meet your needs. Features a stainless steel mounting sleeve with a silver-plated outer conductor and copper inner conductor. There is a SO-239 connector inside the mounting sleeve for easy mounting and dismounting for storage. The suggested mount for this AIS antenna is Shakespeare Style 4187-HD Ratchet Mount. Specifications for Shakespeare AIS 4ft Phase III Antenna: Manufacturer: Shakespeare Color: White Length: 48 in Fabric/Material: Fiberglass Features of Shakespeare AIS 4ft Phase III Antenna Length (Inches): 48" DB Gain (dB): 3db Construction: Fiberglass Color: White Cable Length (Feet): n/a Antenna Band: AIS Package Contents: Shakespeare AIS 4ft Phase III Antenna Shakespeare 6396-AIS-R: 4ft Phase III Antenna AIS