The OptiBeam OB17-4 17 Element 4 Band Yagi is the “best four-band Yagi in the world,” featuring the equivalent of four big monobanders on one 39 ft. (11.9 m) boom with no traps, for unparalleled efficiency. With three active elements for 40 meters, four elements for 20 meters, four wide-spaced elements for 15 meters, and six active elements for 10 meters, this high-performance Yagi antenna is designed for amateur radio operators who demand exceptional coverage and efficiency across the four main bands: 40, 20, 15 and 10 meters. This rugged model features a compact turning radius of 30 ft. (9.15 m) for it size, combining robust RF performance with a mechanically balanced design and practical installation. Offering solid durability, the OptiBeam OB17-4 is a robust and reliable antenna, ideal for operators wanting high gain, excellent front-to-back performance and mechanical resilience across the major HF bands.

Key Specifications

• Bands Covered: 40, 20, 15 and 10 meters

• Boom Length: 39 ft. (11.9 m)

• Longest Element: 47.9 ft. (14.6 m)

• Turning Radius: 30.0 ft. (9.15 m)

• Weight: 220 lbs. (100 kg)

• Wind Load: 473 lb.-f (1,989 N) at 80 mph (130 kph)

• Surface Area: 26.8 sq. ft. (2.48 sq. m)

Element Configuration

The OptiBeam OB17-4 includes three active elements for 40 meters, four elements for 20 meters, four wide-spaced elements for 15 meters, and six active elements for 10 meters.

Electrical Performance

• Gain:

  • 40 m: 4.8 dBd (≈11.7 dBi at 20 m height)

  • 20 m: 7.3 dBd (≈14.9 dBi at 20 m height)

  • 15 m: 7.8 dBd (≈15.5 dBi at 20 m height)

  • 10 m: 8.0 dBd (≈15.8 dBi at 20 m height)

• Front-to-Back Ratio:

  • 40 m: ~25 dB

  • 20 m: ~20 dB

  • 15 m: ~ 22 dB

  • 10 m: ~24 dB

• SWR:

  • 40M: 1.1:1 to 1.8:1 across 150 kHz, low DX or high phone segment settable

  • 20–10M: 1.1:1 to 1.7:1 maximum across each band

Feed System:

• Single 50-ohm coaxial feedline

• Includes choke balun with SO-239 connector

Why Choose the OB17-4?

• Wide frequency coverage across four main HF bands

• High gain and excellent directivity for superior signal performance

• Durable construction rated for harsh weather conditions

• Simplified installation with single-feed design

OptiBeam's antenna technology has achieved directional antennas with extraordinary electrical properties, including the highest efficiency, optimum band coverage, constant gain, and virtually unchanging patterns across the band, with low SWR. These antennas maintain consistent electrical characteristics under all weather-conditions and include a high power balun with UHF female connector for your 50-ohm coaxial cable.

OptiBeam Antennas are distinguished by their advanced mechanical qualities. Specially configured, stable, and properly shaped element holders, robust square and round booms with effective and solidly built element transitions are hallmarks of OptiBeam quality. They provide advanced physical properties, including proper balance and high stability over the entire system. Elements are perfectly aligned and secured against torsion with minimal sag for a visually pleasing appearance.

OptiBeam antennas are made for those who understand the true value of investing in proven electrical performance and unequalled mechanical quality for the ultimate in reliability. They are built to withstand the harshest conditions using the absolute best materials, including high quality aluminum alloys, UV stable synthetic parts, and stainless steel hardware. OptiBeam antennas are designed to be easier to build than others, often arriving in subassemblies with every part carefully sorted, clearly labeled, and extremely well packed for worry-free shipment and straightforward installation.

For enthusiastic operators of all pursuits, OptiBeam provides the advantage of pure performance. Proven in the field and confirmed by the most demanding hams around the world — OptiBeam is the perfect choice for your station.