Sirio Gain Master 1/2 Wave Base 10m Ham Antenna 500W Continuous, No Tuning, 27.2-30MHz

The Sirio Gain Master 1/2 is a high-performance, centre-fed 1/2 wave base station antenna engineered in Italy for 10-metre amateur radio use. Covering 27.2–30 MHz with no tuning required, it delivers 0 dBd (2.15 dBi) gain and handles up to 500W continuous (CW) — a serious antenna for serious 10m HAM operators. Updated in 2024 with a new plastic reinforcement sleeve for added durability. Standing at 5560mm (18.24ft) 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)
• 27.2–30 MHz coverage — no tuning required
• Gain: 0 dBd / 2.15 dBi
• Bandwidth: ≥1.8 MHz @ SWR ≤2
• Designed for 10m amateur (HAM) radio
• Omnidirectional radiation pattern
• Linear vertical polarisation
• 1/2λ centre feed design
• On-mast mounting
• SO-239 (UHF-Female) connector
• Height: 5560mm / 18.24ft
• 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: 1/2λ centre feed base antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• Frequency range: 27.2–30 MHz (no tuning required)
• Systems: 10m amateur (HAM)
• Gain: 0 dBd / 2.15 dBi
• Bandwidth: ≥1.8 MHz @ SWR ≤2
• Max power: 500W continuous (CW)
• Connector: SO-239 (UHF-Female)
• Height: 5560mm / 18.24ft
• Mounting: On-mast
• Materials: Anodised aluminium, copper, stainless steel, fibreglass, UV-stabilised thermoplastic
• Country of origin: Italy