Sirio ML 145 Inox CB & 10m Mobile Antenna 900W Peak, Tunable 27-28.5MHz

The Sirio ML 145 Inox is a robust, base-loaded mobile antenna engineered in Italy for CB 27MHz and 10-metre amateur radio use. With 300W continuous power handling (900W short time CW), a tunable frequency range of 27–28.5 MHz, and a bandwidth of ≥1.34 MHz at SWR ≤2, it delivers reliable omnidirectional performance for everyday mobile operation. The Inox designation reflects its stainless steel 17/7 PH construction — offering superior corrosion resistance compared to standard mobile antennas, making it an excellent choice for coastal, marine, or harsh-environment use. Standing at 1420mm (4.66ft) with an on-connector mount for quick, tool-free installation, it's built from copper, brass, stainless steel 17/7 PH, and nylon.

Key Features

• 300W continuous power handling (CW)
• 900W short time power handling (CW)
• Tunable frequency range: 27–28.5 MHz
• Compatible with CB 27MHz & 10-metre amateur radio
• Bandwidth: ≥1.34 MHz @ SWR ≤2
• Omnidirectional radiation pattern
• Linear vertical polarisation
• Base-loaded design for efficient mobile performance
• Stainless steel 17/7 PH construction — superior corrosion resistance
• On-connector mount for quick, tool-free installation
• Height: 1420mm / 4.66ft
• Quality materials: copper, brass, stainless steel 17/7 PH & nylon
• Made in Italy by Sirio

Technical Specifications

• Type: Base loaded mobile antenna
• Radiation: Omnidirectional
• Polarisation: Linear vertical
• Frequency range: 27–28.5 MHz (tunable)
• Systems: CB 27MHz / 10m amateur (HAM)
• Bandwidth: ≥1.34 MHz @ SWR ≤2
• Max power: 900W peak (CW short time) | 300W continuous (CW)
• Height: 1420mm / 4.66ft
• Mounting: On-connector
• Materials: Copper, brass, stainless steel 17/7 PH, nylon
• Country of origin: Italy

Frequently Asked Questions

Does the ML 145 Inox require tuning?
Yes. It is tunable across 27–28.5 MHz, allowing you to optimise SWR for your specific CB or 10m operating frequency. A SWR meter is recommended for initial setup.

What does "Inox" mean?
Inox refers to the stainless steel (17/7 PH grade) construction of the antenna whip. This grade of stainless steel offers superior corrosion and fatigue resistance compared to standard steel, making the ML 145 Inox particularly well suited to coastal, marine-adjacent, and harsh outdoor environments.

How is it mounted?
The ML 145 Inox uses an on-connector mount, meaning it connects directly to a compatible antenna mount (e.g. mirror mount, boot mount, or gutter mount) via its base connector. No separate bracket is required.

What is the maximum power it can handle?
300W continuous (CW) and 900W short time (CW peak), making it suitable for standard CB transceivers as well as higher-power 10m amateur rigs.

Can it be used for 10m amateur radio?
Yes. The tunable range of 27–28.5 MHz overlaps with the lower portion of the 10-metre amateur band. For full 10m band coverage (28–29.7 MHz), a wider-range antenna may be more appropriate, but the ML 145 Inox is well suited to 10m operation near the lower band edge.

Is it suitable for use near the sea or in salty environments?
Yes. The stainless steel 17/7 PH whip is specifically chosen for its corrosion resistance, making this antenna a strong choice for vehicles used in coastal or marine-adjacent environments where standard antennas may corrode prematurely.

How long is the antenna?
The ML 145 Inox stands 1420mm (approximately 4.66ft / 56 inches) tall — a practical length for most vehicle installations.

What connector does the mount use?
The on-connector base is compatible with standard CB/HF mobile antenna mounts. Most mounts output a PL-259 / SO-239 connection for standard coaxial feedline — check your specific mount for compatibility.