Sirio Thunder Base CB & 10m Ham Antenna 300W Peak, No Tuning, 25-29MHz, 1/4λ Helical

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The Sirio Thunder is a compact, 1/4λ helical-loaded base station antenna engineered in Italy for CB 27MHz and 10-metre amateur radio use. With an exceptional bandwidth of ≥5 MHz at SWR ≤2 covering 25–29 MHz with no tuning required, it's one of the most plug-and-play base antennas in the Sirio range — perfect for operators who want reliable, hassle-free performance straight out of the box. With 100W continuous power handling (300W short time CW) and a gain of 0 dBd (2.15 dBi), it stands at just 960mm (3.15ft) tall, making it ideal for space-restricted installations. Designed for on-mast mounting and constructed from aluminium, copper, galvanised steel, and nylon. Key Features 100W continuous power handling (CW) 300W short time power handling (CW) 25–29 MHz coverage — no tuning required Exceptional bandwidth: ≥5 MHz @ SWR ≤2 Compatible with CB 27MHz & 10-metre amateur radio Gain: 0 dBd / 2.15 dBi Omnidirectional radiation pattern Linear vertical polarisation Compact 1/4λ helical loaded design On-mast mounting SO-239 (UHF-Female) connector Height: 960mm / 3.15ft — ideal for space-restricted installations Durable materials: aluminium, copper, galvanised steel & nylon Made in Italy by Sirio Technical Specifications Type: 1/4λ helical loaded base antenna Radiation: Omnidirectional Polarisation: Linear vertical Frequency range: 25–29 MHz (no tuning required) Systems: CB 27MHz / 10m amateur (HAM) Gain: 0 dBd / 2.15 dBi Bandwidth: ≥5 MHz @ SWR ≤2 Max power: 300W peak (CW short time) | 100W continuous (CW) Connector: SO-239 (UHF-Female) Height: 960mm / 3.15ft Mounting: On-mast Materials: Aluminium, copper, galvanised steel, nylon Country of origin: Italy Show more