Sirio Gain Master 5/8 Wave Base CB & 10m Antenna 500W Continuous, No Tuning, 25.5-30MHz

The Sirio Gain Master 5/8 is a premium, centre-fed 5/8 wave base station antenna engineered in Italy for CB 27MHz and 10-metre amateur radio use. Covering the full 25.5–30 MHz range with no tuning required, it delivers 1–2 dB more gain than conventional 5/8λ antennas and handles up to 500W continuous (CW) — making it one of the most capable base antennas available at this price point. Updated in 2024 with a new plastic reinforcement sleeve for added durability. Standing at an impressive 7360mm (24.15ft) tall and designed for on-mast mounting, it's built from anodised aluminium, copper, stainless steel, fibreglass, and UV-stabilised thermoplastic to withstand years of outdoor use.

Key Features

• 500W continuous power handling (CW)
• Full 25.5–30 MHz coverage — no tuning required
• 1–2 dB gain advantage over conventional 5/8λ antennas
• Compatible with CB 27MHz & 10-metre amateur radio
• Omnidirectional radiation pattern
• Linear vertical polarisation
• 0.625λ centre feed design for superior performance
• On-mast mounting
• SO-239 (UHF-Female) connector
• Height: 7360mm / 24.15ft
• 2024 update: new plastic reinforcement sleeve
• Premium materials: anodised aluminium, copper, stainless steel, fibreglass & UV-stabilised thermoplastic
• Made in Italy by Sirio

Technical Specifications

• Type: 0.625λ centre feed base antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• Frequency range: 25.5–30 MHz (no tuning required)
• Systems: CB 27MHz / 10m amateur (HAM)
• Gain: 1–2 dB above conventional 5/8λ
• Max power: 500W continuous (CW)
• Connector: SO-239 (UHF-Female)
• Height: 7360mm / 24.15ft
• Mounting: On-mast
• Materials: Anodised aluminium, copper, stainless steel, fibreglass, UV-stabilised thermoplastic
• Country of origin: Italy