Grazioli Antennas HW20V 20M 1/2-Wave Vertical Dipole Antennas are a base-fed 1/2-wave vertical dipole antenna designed for use on the entire 20-meter band and tuned through a PTFE-insulated high-voltage variable capacitor. It features heavy-duty construction using AW6063-T66 aluminum alloy tubing and CNC-machined components for exceptional strength and durability. The antenna is supplied with premium AISI 304 and AISI 316 stainless steel hardware to ensure long-term corrosion resistance and dependable outdoor performance. Designed for demanding Amateur Radio applications, the HW20V is rated for up to 3kW continuous power in all operating modes. Each antenna includes a detailed assembly manual and a unique serial number that identifies the production batch and manufacturing data for quality traceability.

Note: The HW20V includes three guy-rope attachment clamps. The use of guy ropes is strongly recommended for maximum stability and performance in high-wind conditions.

- Materials & Construction

The HW20V is constructed from premium AW6063-T66 aluminum alloy tubing, widely regarded as one of the best materials for antenna construction due to its excellent combination of strength, corrosion resistance, and durability. Precision extrusion and cold-drawing processes produce tubing with tightly controlled diameters and wall thicknesses, ensuring accurate fitment between sections. This high level of manufacturing precision minimizes movement between telescoping elements, resulting in a stronger assembly, easier installation, and long-term mechanical stability.

- High-"Q" LC matching circuit

The HW20V uses a specially designed high-Q parallel LC matching circuit to efficiently match the high feed-point impedance of a base-fed half-wave vertical antenna. The air-wound matching coil features widely spaced turns and no metal core, minimizing losses and maximizing efficiency. A PTFE-insulated variable capacitor mounted at the base allows for convenient tuning and is rated to withstand voltages exceeding 40 kV. The matching network is highly resistant to temperature changes, rain, humidity, and high-power operation, ensuring stable performance in demanding conditions. Optimized inductance and capacitance values provide efficient power transfer and support up to 3 kW of continuous RF power in all operating modes. The matching coil is also DC-grounded to help reduce atmospheric noise and static buildup.

- UHF Connector

The HW20V features a premium UHF SO-239 connector engineered for true 50-ohm impedance and reliable high-power performance. Unlike typical commercial SO-239 connectors, it is specifically designed to maintain consistent electrical characteristics up to 500 MHz. The connector is rated to handle up to 5 kW of continuous RF power at 30 MHz and more than 3 kW at 50 MHz, providing a robust connection for demanding amateur radio applications.

The body is made of CW614N nickel-plated brass, while the pin is plated in 24K gold to avoid oxidation and is equipped with a 4-fin insulator that maintains its centering and elasticity to avoiding contact losses.

The insulating material is PTFE, one of the best insulators due to its exceptional electrical and thermal properties (low dielectric constant and reduced loss factor, operating temperature from -100 to +260 °C). The assembly is protected by a special elastomer hood that prevents water and humidity infiltration.

- Mounting Bracket

The heavy-duty mounting bracket is manufactured from 0.09 in. (2.5 mm) thick AISI 304 stainless steel for excellent strength and corrosion resistance. It attaches to the antenna tube using a clamping system that provides an exceptionally secure mechanical connection. Mast mounting is accomplished with AISI 304 stainless steel M6 V-bolts and high-profile nuts, allowing for easy installation and secure tightening while ensuring long-term durability in outdoor environments.

Additional Features & Specifications:

• Frequency Range: 14 – 14.350 MHz

• Impedance: 50-Ohm Unbalanced

• Radiation Type: Omnidirectional

• Polarization: Linear Vertical

• Gain: 0 dBd (2.15 dBi)

• Bandwidth (@ SWR 2:1): ≥ 0.8 MHz

• SWR @ Resonance: ≤ 1.2:1 Typical, ≤ 1.1:1

• Max. Input Power: 3,000 Watts Continuous, All Modes

• Feed System: High-Q L-C Circuit, DC Ground

• Input Connector: 50Ω UHF SO-239 Female with PTFE Insulator and Gold-Plated Pin

• Materials: AW6063-T66 Aluminum Alloy hard-drawn tubing, fiberglass, brass, and PTFE. All hardware is AISI 304 and AISI 316 stainless steel.

• Wind Surface Area: 2.85 sq. ft. (0.265 m²)

• Wind Load @ 80 MPH (No Ice): 245.17 N (25 kgf)

• Wind Survival Rating (No Ice): 130 km/h (81 mph) with guy ropes

• Total Height: 35.10 ft. (10.7 m)

• Whip Length: 33.23 ft. (10.13 m), Half-Wave

• Mounting Mast Diameter: Ø 1.57 – 2.13 in. (40 – 54 mm)

• Antenna Net Weight: 11.9 lbs. (5.4 kg)

• Package Dimensions: 5.5 × 5.5 × 57 in. (14 × 14 × 145 cm)

• Shipping Weight: 14.6 lbs. (6.6 kg)