Momobeam Mono3‑20 Monoband Yagi Antennas are engineered using the latest generation design software to deliver exceptional performance across the entire 20‑meter frequency range. With full‑size elements and precision‑optimized geometry, these antennas are ideal for operators who want maximum efficiency, gain, and on‑air reliability without compromise.

Built on a robust square boom, the MONO3‑20 antennas are designed for easy, accurate assembly. Each system includes an assembly tool, spare hardware (bolts and aluminum tubing), and fully labeled components. All hardware is packaged in clearly marked bags, and every aluminum tube is labeled to ensure a fast, frustration‑free installation experience.

These antennas are suitable for both mast mounting and side‑mount tower configurations, offering excellent flexibility for station design. A medium‑duty rotor is required for proper operation.

To further enhance performance and reduce feedline issues, every MONO3‑20 antenna comes standard with a 3kW RF choke balun—a premium component that many manufacturers offer only as an upgrade. Momobeam RF Chokes are constructed from high‑quality, low‑loss, double‑shielded coaxial cable with a Teflon dielectric, combined with carefully selected ferrite material sleeved over the cable to create a high‑impedance path for RF, providing excellent isolation between the antenna and the coaxial feedline.

Mono3-20 Features and Specifications:

• RF Choke Balun: 3kW included

• Bandwidth@ S.W.R. ≤ 1.5:1: 350kHz

• Longest element: 36.10ft. (1100cm)

• Power Handling: 10kW

• Wind Area: 7.10 sq. ft. (0.66m²)

• Wind Load: (80 MPH): (530N) 22.13 ft. lbs.

• Wind Survival*: 100 Mph (160 Km/h)

• Tower Leg/Mast Diameter: 2.0-2.36in. (50/60mm)

• Tower Lift Side: 2.30ft. (70cm) above the tower top Weight: 55.12lbs. (25kg)

• Feedline Connector: (1) 50-Ohm UHF SO-239 female

• Tubes and Plates: Aluminum alloy 6061T6

• Hardware: stainless steel

• Insulating Clamps: polypropylene, UV resistant