Momobeam Tetra14-SF 40/20/15/10-Meter Separately Fed Yagi Antennas represent a new generation of compact, high‑performance HF solutions for contesters, DXers, and multi‑operator stations. These antennas are designed to eliminate the long‑standing challenges created by towers crowded with multiple closely spaced monoband arrays. In many installations, such configurations cause unavoidable interaction between antennas, resulting in distorted radiation patterns and degraded performance. The Tetra14‑SF overcomes these issues through an innovative separately fed architecture that delivers true multiband capability without compromise.

Tetra14‑SF features independent feed points for all four HF bands, allowing stations to operate four transceivers or amplifier setups simultaneously. With appropriate band‑pass filtering, these antennas behave as though each operator has their own monoband Yagi, while requiring only a fraction of the tower space normally consumed by stacked arrays. This approach not only reduces structural load and visual clutter but also produces cleaner patterns, stronger gain, and more predictable performance during competitive operating environments.

To ensure top-tier operation on every band, these antennas use carefully optimized element spacing developed through advanced simulation. The 40‑meter section employs a compact two‑element Reflector/Driver design incorporating end‑loading, a highly effective method pioneered by W6NL. This configuration retains the performance characteristics of a full‑size Yagi while significantly reducing element length, making installation more practical for a wide variety of tower systems. On 10, 15, and 20 meters, each antenna uses a refined four‑element arrangement consisting of a reflector, driven element, and two directors, delivering excellent gain and forward directivity across the higher frequency bands.

Durability, ease of assembly, and station‑friendly construction are central to the Tetra14‑SF design philosophy. These antennas utilize a strong square boom structure, with all aluminum elements and hardware components clearly labeled for efficient assembly. Every antenna includes an assembly tool, spare hardware, and a complete set of four high‑quality 3kW RF choke Baluns, a component other manufacturers often sell as an optional upgrade. Installation is straightforward, requiring four coax feedlines—one for each band—and a medium‑to‑heavy‑duty rotator.

Momobeam Tetra14-SF 40/20/15/10-Meter Separately Fed Yagi Antennas provide exceptional performance, reduced tower complexity, and true multi‑operator capability. They combine the advantages of monoband arrays into a single, compact, and intelligently engineered system. For contesting groups, DXpeditions, or high-demand stations seeking high performance on 10, 15, 20, and 40 meters, these antennas offer a modern and efficient solution that delivers outstanding on‑air results.

Tetra14 Features and Specifications:

• RF Choke Balun: (4) 3kW included

• Bandwidth@ S.W.R. ≤ 1.5:1:

40M - 200kHz

20M – 350kHz

15M – 450kHz

10M – 800kHz

• Longest element: 51.18ft. (1560cm)

• Power Handling: 10kW

• Wind Area: 18.3 sq. ft. (1.7m²)

• Wind Load: (80 MPH): (1364N) 1006.03 ft. lbs.

• Wind Survival*: 100 Mph (160 Km/h)

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

• Tower Lift Side: 2.95ft. (90cm) Weight: 253.53lbs. (115kg)

• Feedline Connector: (4) 50-Ohm UHF SO-239 female

• Tubes and Plates: Aluminum alloy 6061T6

• Hardware: stainless

• Insulating Clamps: polypropylene, UV resistant