ES
EN
- Description
- Specifications
- Reviews (2)
- Customers
- Videos
- How to buy?
BIG SIGNAL 4BS-20
4-element Cubical Quad for maximum DX performance on 14 MHz / 20 meters
The BIG SIGNAL 4BS-20 is the largest and highest-performance model in our monoband lineup for 14 MHz / 20 meters. Its 4 closed full-wave elements are aimed at stations looking for a higher level of gain, directivity and weak-signal performance over long distances.
With 10.38 dBi free-space gain, a 25.54 dB front-to-back ratio and a 56° beamwidth, the 4BS-20 is designed for DX, contesting and high-performance stations that want to get the most from the 20-meter band.
Band: 14 MHz / 20 meters
Type: monoband directional Cubical Quad
Elements: 4 closed full-wave loops
Gain: 10.38 dBi free space
F/B ratio: 25.54 dB
Beamwidth: 56° at -3 dB
Maximum power: 5,000 W PEP
Recommended use: DX / contesting / weak-signal / high-performance stations
Type: monoband directional Cubical Quad
Elements: 4 closed full-wave loops
Gain: 10.38 dBi free space
F/B ratio: 25.54 dB
Beamwidth: 56° at -3 dB
Maximum power: 5,000 W PEP
Recommended use: DX / contesting / weak-signal / high-performance stations
The Flagship Model for DX on 20 Meters
• Four full-wave elements
The 4BS-20 uses four closed full-wave loops specifically optimized for 14 MHz. This configuration delivers high electrical performance without relying on traps, loading coils or physically shortened radiating elements.
The 4BS-20 uses four closed full-wave loops specifically optimized for 14 MHz. This configuration delivers high electrical performance without relying on traps, loading coils or physically shortened radiating elements.
• 10.38 dBi of gain
Its four-element configuration provides 10.38 dBi of free-space gain, making the 4BS-20 the highest-performance option in the BIG SIGNAL lineup dedicated to 20 meters.
Its four-element configuration provides 10.38 dBi of free-space gain, making the 4BS-20 the highest-performance option in the BIG SIGNAL lineup dedicated to 20 meters.
• 25.54 dB front-to-back ratio
Its high F/B ratio provides strong discrimination between the main operating direction and the rear of the antenna, helping reduce unwanted signals and interference arriving from other azimuths.
Its high F/B ratio provides strong discrimination between the main operating direction and the rear of the antenna, helping reduce unwanted signals and interference arriving from other azimuths.
• 56° beamwidth for high selectivity
A 56° -3 dB beamwidth provides a well-defined radiation pattern, especially useful in contesting, crowded bands and situations where separating signals from different directions is important.
A 56° -3 dB beamwidth provides a well-defined radiation pattern, especially useful in contesting, crowded bands and situations where separating signals from different directions is important.
• Clean reception for weak-signal work
The combination of closed elements, horizontal polarization and high directivity can provide favorable signal-to-noise performance in the presence of certain types of electrical interference, particularly useful when working stations near the receiver noise floor.
The combination of closed elements, horizontal polarization and high directivity can provide favorable signal-to-noise performance in the presence of certain types of electrical interference, particularly useful when working stations near the receiver noise floor.
• Designed for long-distance communications
Its gain and directional pattern are aimed at stations that prioritize long-haul DX, helping concentrate transmitted and received energy toward the desired direction and make better use of propagation openings on 20 meters.
Its gain and directional pattern are aimed at stations that prioritize long-haul DX, helping concentrate transmitted and received energy toward the desired direction and make better use of propagation openings on 20 meters.
• Built for demanding permanent installations
With a 35.10 ft (10.70 m) boom, reinforced structure and materials selected for outdoor use, the 4BS-20 is intended for permanent stations where mechanical strength and stability are as important as RF performance.
With a 35.10 ft (10.70 m) boom, reinforced structure and materials selected for outdoor use, the 4BS-20 is intended for permanent stations where mechanical strength and stability are as important as RF performance.
• Current-balun feed system
The antenna includes a current balun for proper feeding from a 50-ohm coaxial line and straightforward integration into high-power stations.
The antenna includes a current balun for proper feeding from a 50-ohm coaxial line and straightforward integration into high-power stations.
The Largest BIG SIGNAL for 20 Meters
The 4BS-20 is designed for operators looking to go beyond a conventional directional antenna. It is the largest 4-element and highest-performance model in our 14 MHz lineup, built for stations where every dB, every weak signal and every degree of selectivity matters.
• 4 full-wave elements.
• 10.38 dBi free-space gain.
• 25.54 dB front-to-back ratio.
• 56° -3 dB beamwidth.
• Up to 5,000 W PEP.
• High directivity and selectivity.
• Especially well suited for DX and contesting.
• 10.38 dBi free-space gain.
• 25.54 dB front-to-back ratio.
• 56° -3 dB beamwidth.
• Up to 5,000 W PEP.
• High directivity and selectivity.
• Especially well suited for DX and contesting.
Four Elements. 10.38 dBi. The BIG SIGNAL Flagship for 20 Meters.
The BIG SIGNAL 4BS-20 combines four full-wave elements, 10.38 dBi of gain and a 25.54 dB F/B ratio in an antenna engineered for stations looking to take DX performance on 14 MHz to the highest level in the BIG SIGNAL 20-meter lineup.
Technical Specifications
Band: 14 MHz / 20 m
Elements: 4 full-wave elements
Gain: 10.38 dBi (free space)
F/B ratio: 25.54 dB
-3 dB beamwidth: 56°
Polarization: horizontal
SWR: 1.1:1 ~ 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 35.10 ft (10.70 m)
Turning radius: 21.52 ft (6.56 m)
Overall height: 17.22 ft (5.25 m)
Weight: approximately 77.2 lb (35 kg)
Wind survival: > 93 mph (> 150 km/h)
Wind load: 26.01 ft² (2.416 m²) | 426.4 lbf (1,896.56 N) | @ 74.6 mph (120 km/h)
Elements: 4 full-wave elements
Gain: 10.38 dBi (free space)
F/B ratio: 25.54 dB
-3 dB beamwidth: 56°
Polarization: horizontal
SWR: 1.1:1 ~ 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 35.10 ft (10.70 m)
Turning radius: 21.52 ft (6.56 m)
Overall height: 17.22 ft (5.25 m)
Weight: approximately 77.2 lb (35 kg)
Wind survival: > 93 mph (> 150 km/h)
Wind load: 26.01 ft² (2.416 m²) | 426.4 lbf (1,896.56 N) | @ 74.6 mph (120 km/h)
4 elements, 10.38 dBi and 25.54 dB F/B
The BIG SIGNAL 4BS-20 is the highest-performance model in the 20-meter lineup, combining 10.38 dBi of gain, a 25.54 dB front-to-back ratio and a 56° -3 dB beamwidth for stations focused on DX and demanding long-distance communications.
Construction and Materials
• Boom-to-mast plate
Heavy-duty 9.84 x 7.87 x 0.39 in (250 x 200 x 10 mm) structural plate, sized to provide a strong and stable connection between the boom and mast.
Heavy-duty 9.84 x 7.87 x 0.39 in (250 x 200 x 10 mm) structural plate, sized to provide a strong and stable connection between the boom and mast.
• Heavy-duty boom
Round 3.15 in diameter x 0.079 in wall (70 x 2 mm) tubing, designed to provide the structural rigidity required for an antenna with a boom length of 35.10 ft (10.70 m).
Round 3.15 in diameter x 0.079 in wall (70 x 2 mm) tubing, designed to provide the structural rigidity required for an antenna with a boom length of 35.10 ft (10.70 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.
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.
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.
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.
Special copper wire with a polyethylene (PE) jacket, selected to provide excellent weather protection and high mechanical strength.
• Feed system
Equipped with a current balun for connection to a 50-ohm coaxial feed line.
Equipped with a current balun for connection to a 50-ohm coaxial feed line.
Reviews
Write your review
BIG SIGNAL 4BS-20 (ZL1ACE from EA5CTE's QTH)
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.
After more than three years of continuous, real-world operation, I can say without hesitation that the Big Signal Qubical Quad 4-Element for 20 meters is not just an antenna?it is a true work of engineering art.
Time has proven its excellence. Despite constant exposure to harsh weather conditions, its performance today is exactly as impressive as it was on day one. The mechanical design, materials, and attention to detail clearly reflect a product built by people who truly understand both RF performance and long-term durability.
On the air, this antenna is simply extraordinary. Its gain and directivity are outstanding, and its ability to pull weak signals out of the noise is nothing short of remarkable. During the CQ WW DX 2025 (SSB) Contest, this antenna helping me to achieve #1 in Asia, and #9 worldwide. Even the most challenging QSOs?such as mobile stations across oceans?felt effortless, with signals regularly reaching 59+.
Beyond performance, what truly sets Big Signal apart is the people behind the product. I would like to extend my sincere appreciation to Juan and the entire Big Signal team for their world-class support, professionalism, and passion over the years. Their commitment does not end at delivery?it continues long after the antenna is in the air.
If you are searching for the ?magic key? to unlocking propagation and pushing your station to the next level, the answer is clear Big Signal delivers not in promises, but in results.
73 de HZ1LR,
Ayman
Las estaciones australianas se reciben hasta 9+40 dB por el Paso Largo. Ellos me pasan 9+20 con 80 W.