Momobeam TRI7 20/15/10 Meter Tri-Band Yagi Antennas are compact, high‑performance antenna systems engineered for operators seeking exceptional results on 20, 15, and 10 meters while using a single coaxial feed. These antennas are designed to deliver strong, reliable communication performance in a small footprint, making them ideal for both limited‑space installations and full‑size stations.

On 20 and 15 meters, the antennas utilize a full‑size reflector/driver configuration that offers performance far beyond older‑generation designs, providing improved forward gain, cleaner patterns, and excellent band coverage. On 10 meters, they incorporate a three‑element system—reflector, driver, and director—optimized with advanced simulation software to achieve maximum efficiency and predictable behavior across the band.

Assembly is fast and stress‑free, requiring no calibration or band‑specific adjustments such as choosing between CW or SSB during installation. With an SWR consistently under 1.5:1 across all operating bands, these antennas are fully compatible with modern transceivers and linear amplifiers, ensuring stable operation even at high power levels.

Each unit includes a complete set of accessories, such as an assembly tool, spare hardware, and a robust 3kW RF choke balun—a valuable component that many competing manufacturers sell separately. The square‑boom construction and clearly labeled aluminum parts, each organized in separate bags, ensure intuitive and error‑free assembly from start to finish.

With only a single coaxial cable required and compatibility with medium/light‑duty rotators, the TRI7 antennas combine simplicity, advanced engineering, and excellent build quality, making them an outstanding choice for Amateur Radio operators who want maximum performance with minimal installation effort. Optional configurations, including separate‑feed versions (MOO‑TRI7101520SF), offer additional flexibility for operators who prefer independent band feeds.

TRI7 20/15/10 Features and Specifications:

• RF Choke Balun: (1) 3kW included

• Bandwidth@ S.W.R. ≤ 1.5:1:

20M – 350kHz

15M – 450kHz

10M – 800kHz

• Longest element: 36.45ft. (1111cm)

• Power Handling: 10kW

• Wind Area: 7.32 sq. ft. (0.68m²)

• Wind Load: (80 MPH): (565N) 416.72 ft. lbs.

• Wind Survival*: 100 Mph (160 Km/h)

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

• Tower Lift Side: 4.27ft. (130cm) Weight: 59.52lbs. (27kg)

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

• Tubes and Plates: Aluminum alloy 6061T6

• Hardware: stainless steel

• Insulating Clamps: polypropylene, UV resistant