Grazioli MV3 20/15/10 m Tri-Band HF Vertical Antenna – 3 kW

The Grazioli MV3 is a tri-band vertical antenna designed for operation on the 20, 15 and 10-metre amateur radio bands. Its quarter-wave Ground Plane design uses parallel resonant elements, allowing all three bands to be covered by a single antenna.

The antenna is fed directly at its base with a nominal impedance of 50 Ω and a female UHF connector. The feed point is DC grounded, helping to discharge static electricity accumulated on the antenna.

The MV3 provides an omnidirectional radiation pattern with vertical polarisation, making it suitable for local, national and international HF communications. When correctly assembled and adjusted, it provides a typical SWR of 1.5:1 or lower.

Construction features AW6063-T66 aluminium-alloy tubing, CNC-machined components and AISI 304 and 316 stainless-steel hardware. This combination provides excellent mechanical strength and durability for permanent outdoor installations.

The antenna handles up to 3 kW continuous power in all operating modes and includes a genuine FAIR-RITE FT240-43 ferrite toroid for constructing a common-mode choke close to the feed point.

Main features

• Brand: Grazioli
• Model: MV3
• Type: tri-band Ground Plane vertical antenna
• Electrical design: quarter-wave with parallel elements
• Bands: 20, 15 and 10 metres
• Feed system: direct base feed
• Impedance: 50 Ω unbalanced
• Polarisation: vertical
• Radiation pattern: omnidirectional
• Gain: 0 dBd / 2.15 dBi
• Typical SWR: ≤ 1.5:1
• Bandwidth at SWR ≤ 2:1: full 20 and 15-metre bands
• 10-metre bandwidth: more than 1.2 MHz at SWR ≤ 2:1
• Maximum power: 3,000 W continuous, all modes
• Connector: female UHF, SO-239 type
• Connector insulator: PTFE
• Centre contact: gold plated
• DC connection: DC grounded
• Total height: 5.63 m
• Vertical radiator length: 5.05 m
• Radials: four horizontal radials
• Radial length: approximately 2.4 m each
• Approximate installation diameter: 4.8 m
• Main material: AW6063-T66 aluminium
• Hardware: AISI 304 and 316 stainless steel
• Compatible mast diameter: 40–52 mm
• Wind survival: up to 130 km/h without ice
• Wind surface area: 0.21 m²
• Net weight: approximately 5 kg
• Packed weight: approximately 6.35 kg
• Package dimensions: 14 × 14 × 145 cm
• Installation: outdoor mast mounting
• Country of manufacture: Italy

Main advantages

• Three HF bands from a single antenna
• No extensive ground-level radial field required
• Direct 50 Ω feed
• High continuous power handling
• Heavy-duty construction for permanent installation
• Adjustable elements for SWR optimisation
• Corrosion-resistant hardware
• Suitable for stations using a linear amplifier
• Omnidirectional coverage

Recommended applications

• Amateur radio base stations
• Operation on the 20, 15 and 10-metre bands
• DX communications
• SSB, CW and digital modes
• Stations using linear amplifiers
• Rooftop, tower and mast installations
• Operators requiring a multiband HF vertical solution
• Locations where several monoband antennas cannot be installed

Package contents

• Grazioli MV3 antenna
• Four horizontal radials
• Resonant elements and mounting supports
• Mounting clamps and hardware
• Mast mounting bracket
• FAIR-RITE FT240-43 ferrite toroid
• Detailed assembly and adjustment manual

Important note

The antenna must be installed on a mast measuring 40–52 mm in diameter, with sufficient clearance for the approximately 2.4 m radials. The mast, brackets and supporting structure must be selected according to the antenna’s wind area and local installation conditions.

The supplied ferrite toroid is intended for constructing a common-mode choke close to the antenna connector. The coaxial cable and connectors required to build the choke are not included and must be selected according to the intended power level.

The DC-grounded feed helps discharge static electricity but does not replace a properly designed earthing and lightning-protection system.

High-power operation must comply with local regulations, amateur radio licence conditions and the power ratings of the coaxial cable, connectors and all other installation components.