Momobeam TRI7-SF Separate Feed 20/15/10 Meter Tri-Band Yagi Antennas

Momobeam TRI7-SF Separate Feed 20/15/10 Meter Tri-Band Yagi Antennas are the smallest triband antenna in the Momobeam lineup that features independent feed points. These antennas use full‑size reflector and driver elements on both 20 and 15 meters, ensuring excellent gain and bandwidth. On 10 meters, they incorporate a three‑element design—reflector, driver, and director—optimized to deliver strong, reliable performance across the band.

The TRI7‑SF antennas are perfectly suited for multi‑transceiver stations, offering exceptional versatility thanks to its separate‑feed architecture. This design allows the antennas to be used simultaneously by three different transceivers, functioning much like three individual monoband antennas when paired with appropriate band‑pass filters to protect station equipment. As a result, operators can significantly reduce the number of antennas installed on their towers while maintaining full operating capability.

Each TRI7‑SF antenna includes a complete accessory set, featuring an assembly tool, spare hardware, and a pair of aluminum replacement tubes. Three high‑quality 3kW RF choke baluns are also supplied as standard—expensive components that many antenna manufacturers offer only as optional extras. These included baluns help ensure clean, efficient operation across all bands.

Assembly is intentionally simple and intuitive. The antennas use a square‑boom design, with every piece of hardware packaged in individually labeled bags and all aluminum tubes clearly marked. This thoughtful organization makes installation fast, clear, and error‑free, even for complex station configurations.

With their separate‑feed capability, TRI7‑SF antennas make it easy for station owners to transition into multi‑operator contest categories without requiring additional tower space. Key advantages of this solution include a reduced number of installed antennas, lower wind load, elimination of external diplexers or triplexers, and straightforward integration into stacked or multi‑antenna arrays if desired.

These antennas require three coaxial cables and a medium‑ to light‑duty rotator. With their combination of versatility, efficiency, and thoughtful engineering, the TRI7‑SF Separate Feed Yagi Antennas offer a powerful and space‑efficient solution for serious Amateur Radio operators.

TRI7 Separate Feed 20/15/10 Features and Specifications:

• RF Choke Balun: (3) 3kW included

• Bandwidth@ S.W.R. ≤ 1.5:1:

20M – 350kHz

15M – 450kHz

10M – 800kHz

• Longest element: 36.42ft. (1110cm)

• Power Handling: 10kW

• Wind Area: 7.32 sq. ft. (0.68m²)

• Wind Load: (80 MPH): (558N) 411.56 ft. lbs.

• Wind Survival*: 100 Mph (160 Km/h)

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

• Tower Lift Side: 1.50ft. (45cm) Weight: 61.73lbs. (28kg)

• Feedline Connector: (3) 50-Ohm UHF SO-239 female

• Tubes and Plates: Aluminum alloy 6061T6

• Hardware: stainless steel

• Insulating Clamps: polypropylene, UV resistant