BIG SIGNAL 3BS-20
3-element full-wave Cubical Quad for high-performance DX on 14 MHz / 20 meters
The BIG SIGNAL 3BS-20 is a 3-element full-wave monoband directional antenna developed for operators seeking a higher level of gain, directivity and weak-signal reception on the 14 MHz / 20-meter band.
Its closed-loop architecture and horizontal polarization combine high electrical efficiency with a clearly defined directional pattern, making it an excellent choice for DX, contesting and stations focused on long-distance communications.
Band: 14 MHz / 20 meters
Type: monoband directional Cubical Quad
Elements: 3 full-wave loops
Gain: 9.39 dBi free space
F/B ratio: 22.6 dB
Beamwidth: 62° at -3 dB
Polarization: horizontal
Recommended use: DX / contesting / weak-signal / high-performance stations
Why Choose the BIG SIGNAL 3BS-20?
• Three full-wave elements
The 3BS-20 uses three closed full-wave loops specifically optimized for 14 MHz. This architecture is designed to make the most of each element without relying on loading coils, traps or physically shortened radiators.
• 9.39 dBi of gain on 20 meters
Its three-element configuration provides 9.39 dBi of free-space gain, offering a significant step up in performance for stations seriously focused on DX on 14 MHz.
• High directivity and excellent rear rejection
With a 22.6 dB front-to-back ratio and a 62° -3 dB beamwidth, the 3BS-20 concentrates energy toward the desired direction while helping reduce signals and interference arriving from other directions.
• Clean reception for weak signals
Its closed-loop geometry, combined with a well-defined directional pattern, can provide favorable signal-to-noise performance in the presence of certain types of electrical interference, particularly useful when working signals close to the receiver noise floor.
• Designed for serious DX
The combination of gain, horizontal polarization and directivity is especially well suited for long-distance communications, helping operators make better use of propagation openings on one of the most important DX bands.
• Strong performance at practical installation heights
Cubical Quad geometry is especially attractive when a favorable balance of installation height, radiation angle and performance is required without depending on extremely tall support structures.
• 18.60 ft (5.67 m) turning radius
Despite using three full-wave elements on 20 meters, the 3BS-20 maintains a turning radius of 18.60 ft (5.67 m), providing a very attractive balance between physical size and directional performance.
• Lightweight for its size
At approximately 48.5 lb (22 kg), the structure is designed to combine mechanical strength and rigidity without adding unnecessary load to the tower, mast or rotator system.
• Simple installation and direct 50-ohm feed
The antenna is designed for straightforward integration into high-performance stations, with a direct 50-ohm feed and no need for complex external impedance-matching systems.
A Cubical Quad Built to Reach Farther
The BIG SIGNAL 3BS-20 is aimed at operators looking to move beyond a basic directional antenna on 20 meters. Its three full-wave elements provide a combination of gain, selectivity and clean reception designed for high-performance DX stations.
• 3 full-wave elements.
• 9.39 dBi free-space gain.
• 22.6 dB front-to-back ratio.
• 62° -3 dB beamwidth.
• High directivity and selectivity.
• Excellent choice for DX and contesting.
• Direct 50-ohm feed.
Three Elements to Take 20 Meters to the Next Level.
The BIG SIGNAL 3BS-20 combines 9.39 dBi of gain, a 22.6 dB F/B ratio and three full-wave elements in an antenna engineered for stations looking to maximize their DX performance on 14 MHz.
Technical Specifications
Band: 14 MHz / 20 m
Elements: 3 full-wave elements
Gain: 9.39 dBi (free space)
F/B ratio: 22.6 dB
-3 dB beamwidth: 62°
Polarization: horizontal
SWR: 1.1:1 ~ 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 27.03 ft (8.24 m)
Turning radius: 18.60 ft (5.67 m)
Overall height: 17.22 ft (5.25 m)
Weight: approximately 48.5 lb (22 kg)
Wind survival: > 93 mph (> 150 km/h)
Wind load: 19.69 ft² (1.829 m²) | 322.8 lbf (1,435.92 N) | @ 74.6 mph (120 km/h)
9.39 dBi and 22.6 dB F/B for high-performance DX
The BIG SIGNAL 3BS-20 combines 3 full-wave elements with 9.39 dBi gain, a 22.6 dB front-to-back ratio and a 62° -3 dB beamwidth, providing high directivity for long-distance communications on 14 MHz.
Construction and Materials
• Boom-to-mast plate
Heavy-duty 9.84 x 5.91 x 0.31 in (250 x 150 x 8 mm) structural plate, sized to provide a strong and stable connection between the boom and mast.
• Heavy-duty boom
Square 3.15 in diameter x 0.079 in wall (70 x 2 mm) tubing, sized to provide the structural rigidity required for an antenna with an overall boom length of 27.03 ft (8.24 m).
• Spreader support system
Constructed from 1.18 x 0.20 in (30 x 5 mm) angle profiles and incorporating a 0.16 in (4 mm) boom stabilizing element to increase overall rigidity and structural stability.
• Fasteners and hardware
Made from W4 stainless steel, selected to provide high mechanical strength and long-term durability in permanent outdoor installations.
• Fiberglass system
Custom-made fiberglass tubing with a half-round (semicircular) cross-section rather than conventional round tubing, specifically designed to fit the surface of the spreader supports. Reinforced with fiberglass fabric and UV protection for increased mechanical strength and long-term outdoor durability.
• BIG SIGNAL Wire by Messi & Paoloni
Special copper wire with a polyethylene (PE) jacket, selected to provide excellent weather protection and high mechanical strength.
• Feed system
Direct 50-ohm feed.
The purchase of the products is always made on request. We manufacture all products, so manufacturing times can be added. That is why the final price of the purchase, as the final price of the shipping costs will be confirmed in an email sent afterwards.
The form of payment will be made once the email is received, so at all times you can cancel the order informing us of the process.
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