Sirio Signal Keeper Base CB & 10m Ham Antenna 300W Peak, Tunable 26-28MHz, 1/4λ Ground Plane

The Sirio Signal Keeper is a neat, 1/4λ base-loaded ground plane base station antenna engineered in Italy for CB 27MHz and 10-metre amateur radio use. With 100W continuous power handling (300W short time CW), a wide tunable frequency range of 26–28 MHz, a bandwidth of ≥800 kHz at SWR ≤2, and a gain of 0 dBd (2.15 dBi), it's a compact and versatile base antenna suited to home, office, or portable mast installations. Standing at 2370mm (7.78ft) tall and designed for on-mast mounting, it's constructed from aluminium, chromed brass, stainless steel, nylon, and zamak for a quality finish and long-lasting durability.

Key Features

• 100W continuous power handling (CW)
• 300W short time power handling (CW)
• Wide tunable frequency range: 26–28 MHz
• Compatible with CB 27MHz & 10-metre amateur radio
• Gain: 0 dBd / 2.15 dBi
• Bandwidth: ≥800 kHz @ SWR ≤2
• Omnidirectional radiation pattern
• Linear vertical polarisation
• 1/4λ base-loaded ground plane design
• On-mast mounting
• SO-239 (UHF-Female) connector
• Height: 2370mm / 7.78ft
• Premium materials: aluminium, chromed brass, stainless steel, nylon & zamak
• Made in Italy by Sirio

Technical Specifications

• Type: 1/4λ base-loaded ground plane base antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• Frequency range: 26–28 MHz (tunable)
• Systems: CB 27MHz / 10m amateur (HAM)
• Gain: 0 dBd / 2.15 dBi
• Bandwidth: ≥800 kHz @ SWR ≤2
• Max power: 300W peak (CW short time) | 100W continuous (CW)
• Connector: SO-239 (UHF-Female)
• Height: 2370mm / 7.78ft
• Mounting: On-mast
• Materials: Aluminium, chromed brass, stainless steel, nylon, zamak
• Country of origin: Italy