The Sirio SB 3 U is a high-quality, 3/4λ J-pole VHF marine band base antenna engineered in Italy for professional and leisure marine communications. Covering 156–163 MHz with no tuning required, it delivers 100W CW power handling and a gain of 0 dBd (2.15 dBi) with a clean omnidirectional radiation pattern. A key feature is its DC-ground protection, providing inherent lightning protection — essential for exposed marine installations. Connecting via SO-239 (UHF-Female), it supports on-mast or on-wall mounting and stands at 1465mm (4.81ft). Constructed from chromed brass, fibreglass, and nylon for corrosion-resistant marine durability. Key Features 100W CW power handling VHF Marine Band coverage: 156–163 MHz — no tuning required Gain: 0 dBd / 2.15 dBi DC-ground lightning protection — essential for marine use Omnidirectional radiation pattern Linear vertical polarisation 3/4λ J-pole design On-mast or on-wall mounting SO-239 (UHF-Female) connector Height: 1465mm / 4.81ft Corrosion-resistant materials: chromed brass, fibreglass & nylon Made in Italy by Sirio Technical Specifications Type: 3/4λ J-pole VHF marine base antenna Radiation: Omnidirectional Polarisation: Linear vertical Frequency range: 156–163 MHz (no tuning required) Systems: VHF Marine Band Gain: 0 dBd / 2.15 dBi Max power: 100W CW Grounding: DC-ground Connector: SO-239 (UHF-Female) Height: 1465mm / 4.81ft Mounting: On-mast / on-wall Materials: Chromed brass, fibreglass, nylon Country of origin: Italy
