Sirio CX 144 2m Ham Base Antenna 250W, 2.15 dBi Gain, 144-148MHz, 3/4λ Coaxial J-Pole, SO-239

The Sirio CX 144 is a high-quality, 3/4λ coaxial J-pole base station antenna engineered in Italy for 2-metre amateur radio use. Covering 144–148 MHz at SWR ≤1.5, it delivers 250W CW power handling and a gain of 0 dBd (2.15 dBi) with a clean omnidirectional radiation pattern. The coaxial J-pole design provides a DC ground path, offering inherent lightning protection and eliminating the need for a separate ground plane or radials. Standing at 1620mm (5.31ft) and designed for on-mast mounting, it connects via SO-239 (UHF-Female) and is constructed from aluminium, brass, galvanised steel, and zamak for durable outdoor performance.

Key Features

• 250W CW power handling
• Frequency range: 144–148 MHz @ SWR ≤1.5
• Optimised for 2-metre amateur radio (HAM)
• Gain: 0 dBd / 2.15 dBi
• Omnidirectional radiation pattern
• Linear vertical polarisation
• 3/4λ coaxial J-pole design — DC grounded, no radials required
• On-mast mounting
• SO-239 (UHF-Female) connector
• Height: 1620mm / 5.31ft
• Durable materials: aluminium, brass, galvanised steel & zamak
• Made in Italy by Sirio

Technical Specifications

• Type: 3/4λ coaxial J-pole base antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• Frequency range: 144–148 MHz @ SWR ≤1.5
• Systems: 2m amateur (HAM)
• Gain: 0 dBd / 2.15 dBi
• Max power: 250W CW
• Connector: SO-239 (UHF-Female)
• Height: 1620mm / 5.31ft
• Mounting: On-mast
• Materials: Aluminium, brass, galvanised steel, zamak
• Country of origin: Italy