Galaxy 5018 15' 2” VHF Antenna - 9dB Gain
This highly sophisticated design is outstanding for long distance communications. Extra rugged for salt water durability, and stability in high seas. Surprisingly light weight. 
Features:
Phased 1/2 wave elements in a collinear array with choking sleeve to suppress cable radiation
Brass and copper elements for maximum range and efficiency
Stainless steel ferrule with standard 1"-14 thread
20' RG-8/X low-loss cable plus a PL-259 connector
Suggested Mount: Shakespeare Style 409-R or 410-R Mounting Kit (pictured mount not included)
Two sectiions
5 Year Warranty
Technical Specifications:
Gain: 9dB
Frequency: VHF Marine Band
Bandwidth: (within 2.0:1 VSWR) 3 MHz
SWR: 1.5:1 at 156.8 MHz
Max Input (Watts): 150W
DC Ground: NO
Height (Feet): 15'2"
Polarization: Vertical