The Grazioli Antennas MV7 is a base-fed 1/4-wave multiband vertical ground plane antenna designed to provide coverage of the 40, 20, 17, 15, 12, 10, and 6-meter amateur radio bands from a single antenna system. Standing 29.4 ft (8.97 m) tall, the MV7 expands upon the proven MV6 platform by adding 40-meter capability while maintaining a compact footprint and efficient multiband operation. The antenna features heavy-duty construction utilizing premium AW6063-T66 aluminum alloy tubing, precision CNC-machined components, and high-quality AISI 304 and AISI 316 stainless steel hardware for exceptional strength, durability, and long-term corrosion resistance. Rated for up to 1,500 watts SSB on 40 meters and 3 kW on all other bands, the MV7 is engineered for demanding amateur radio applications. Each antenna includes a detailed assembly manual and a unique serial number identifying the production batch and manufacturing data for quality traceability.

Note: The MV7 includes a guying wheel for use with non-conductive guy ropes. Guying is recommended when the antenna is installed in areas subject to high wind conditions.

- Materials & Construction

The MV7 is constructed from premium AW6063-T66 aluminum alloy tubing, a material chosen for its excellent combination of strength, durability, corrosion resistance, and lightweight characteristics. Precision CNC-machined components ensure accurate fitment and robust mechanical integrity throughout the antenna structure. All mounting and fastening hardware is manufactured from AISI 304 and AISI 316 stainless steel to provide long-term protection against corrosion and environmental exposure.

- Dual-Band 40/20 Meter Radiating System

The MV7 is based on the established MV6 platform but incorporates a specially designed dual-band 40/20-meter central radiator. A loading coil combined with a capacitive top section allows the antenna to operate efficiently on both bands by isolating portions of the 20-meter radiator while providing the required inductive loading for 40-meter operation. The upper radiating section utilizes telescoping tubes that allow adjustment and calibration across the entire 40-meter band while presenting minimal wind resistance.

- DBFC Counterpoise System

A key innovation of the MV7 is its DBFC (Dual Band Folded Counterpoise) system, a unique design developed to extend antenna performance to 40 meters without requiring long wire radials or loaded radial systems. The DBFC system uses a lightweight AISI 316 stainless steel stranded cable attached to one of the antenna's radials to create a dual-band electrical counterpoise. The combined length of the cable and aluminum radial forms an approximately quarter-wave counterweight on 40 meters while remaining compact through a folded arrangement. This design allows lower-frequency operation while preserving the performance characteristics of the higher amateur bands.

- FAIR-RITE RF Choke System

The MV7 is supplied with an original FAIR-RITE FT240-43 ferrite toroid manufactured in the USA for construction of a high-performance RF choke. When installed directly below the antenna feed point, the completed choke significantly attenuates common-mode currents throughout the HF spectrum from 1.8 to 30 MHz, helping to improve antenna efficiency and reduce unwanted RF on the feed line.

- Proprietary High-Power UHF Connector

Rather than utilizing a conventional commercial SO-239 connector, the MV7 employs a proprietary connector engineered and manufactured by Grazioli. The connector features a true 50-ohm characteristic impedance and is rated for operation up to 500 MHz. Its robust design supports 5 kW continuous RF power at 30 MHz and more than 3 kW at 50 MHz. The connector body is manufactured from nickel-plated CW614N brass, while the center pin is 24K gold-plated to prevent oxidation and maintain reliable electrical contact. A PTFE insulator provides excellent electrical and thermal performance, and a protective elastomer hood helps prevent water and moisture intrusion.

- Heavy-Duty Mounting System

The mounting bracket is fabricated from 0.098 in (2.5 mm) thick AISI 304 stainless steel and secures to the antenna using a robust clamping system designed for long-term mechanical stability. Mast attachment is accomplished through an AISI 304 stainless steel M6 V-bolt and column-nut assembly, providing secure installation and dependable support in demanding outdoor environments.

Additional Features & Specifications:

- Electrical Specifications

• Type: Ground Plane 1/4-Wave Vertical with Parallel Radial Elements

• Band Coverage: 40m, 20m, 17m, 15m, 12m, 10m, and 6m Amateur Bands

• Feed Method: Base-Fed

• Impedance: 50-Ohm Unbalanced

• Radiation Pattern: Omnidirectional

• Polarization: Linear Vertical

• Maximum Input Power: 1,500 Watts SSB on 40m; 3,000 Watts on All Other Bands

• RF Choke: Includes FAIR-RITE FT240-43 Ferrite Toroid for Construction of a Common-Mode Current Choke

• Input Connector: Proprietary UHF So-239 Female Connector with PTFE Insulator and 24K Gold-Plated Center Pin

• Connector Frequency Rating: Up to 500 MHz

• Connector Power Rating: 5kW Continuous at 30 MHz; Greater Than 3kW at 50 MHz

- Mechanical Specifications

• Materials: AW6063-T66 Aluminum Alloy Tubing, Fiberglass, Brass, and PTFE

• Hardware: AISI 304 and AISI 316 Stainless Steel Throughout

• Antenna Height: 29.4 ft. (8.97m)

• Antenna Weight: 18.7 lbs. (8.5kg)

• Radiating System: Dual-Band 40m/20m Central Radiator with Loading Coil and Capacitive Top Section

• Counterpoise System: DBFC (Dual Band Folded Counterpoise) with AISI 316 Stainless Steel Cable

• Mounting Bracket Material: 0.098 in. (2.5mm) Thick AISI 304 Stainless Steel

• Mast Clamp Hardware: AISI 304 Stainless Steel M6 V-Bolt and Column Nuts

• Weather Protection: Elastomer Weather Hood on Feedpoint Connector

• Wind Support: Supplied Guying Wheel for Use with Non-Conductive Guy Ropes in High-Wind Installations

- Additional Features

• Construction: CNC-Machined Components from Solid Stock

• Calibration: Adjustable Telescoping Radiator Sections for Tuning Across the Entire 40m Band

• Static Protection: DC-Grounded Feed System via High-Impedance Inductive Network

• Documentation: Detailed Assembly Manual Included

• Traceability: Unique Serial Number Identifying Production Batch and Manufacturing Data