BIG SIGNAL 6BS-4
6-Element Directional Cubical Quad for DX and Weak-Signal Operation on 70 MHz / 4 Meters
The BIG SIGNAL 6BS-4 is a 6-element directional Cubical Quad, specifically developed for operators looking for gain, directivity and clean reception on the 70 MHz / 4-meter band.
Its architecture based on closed full-wave loops provides an excellent balance between performance, boom length and selectivity, making it an especially attractive choice for terrestrial DX, Sporadic-E propagation, weak-signal work and long-distance communications.
Band: 70 MHz / 4 m
Type: monoband directional Cubical Quad
Elements: 6
Design: closed full-wave loops
Applications: DX / weak signals / Sporadic-E propagation / terrestrial communications
Main advantage: high directivity and excellent signal-to-noise performance in an optimized structure
Why Choose the BIG SIGNAL 6BS-4?
• Six full-wave elements
The 6BS-4 uses closed full-wave loops optimized for 70 MHz, an architecture designed to make efficient use of each antenna element in both transmission and reception.
• High gain with an optimized boom length
The Cubical Quad geometry provides high directional performance while maintaining a compact structure, offering an excellent balance between gain, dimensions and required installation space.
• Clean reception for weak signals
The closed-loop configuration can provide favorable performance against certain types of electrical noise, helping improve the signal-to-noise ratio when receiving signals close to the receiver noise floor.
• High directivity and selectivity
Its directional pattern concentrates transmitted and received energy toward the desired direction while providing good rejection of signals arriving from the sides and rear of the antenna.
• Designed for long-distance communications
The combination of gain, directivity and horizontal polarization makes the 6BS-4 an especially attractive solution for taking advantage of propagation openings and working DX on the 4-meter band.
• An alternative to a conventional Yagi
While a traditional Yagi normally uses open elements, the 6BS-4 employs closed full-wave elements, offering a different design approach focused on combining directivity, efficiency and clean reception.
• Rugged construction for outdoor installations
Built with materials selected for permanent installations, the 6BS-4 is designed to provide rigidity, mechanical stability and long-term durability under continuous outdoor exposure.
Designed to Make the Most of Every 4-Meter Opening
The 70 MHz band can provide highly interesting propagation openings, where having a directional antenna with good gain and selectivity can make a significant difference.
• Terrestrial DX on 70 MHz.
• Weak-signal reception.
• Sporadic-E propagation.
• Long-distance terrestrial communications.
• SSB, CW and digital modes.
• Stations looking for high directivity and strong rejection outside the main lobe.
Six Elements to Get More from the 4-Meter Band.
The BIG SIGNAL 6BS-4 combines six full-wave elements, high directivity and reception optimized for weak signals in an antenna specifically developed for operators who want to seriously explore the possibilities of DX on 70 MHz.
Technical Specifications
Band: 70 MHz / 4 m
Elements: 6
Gain: 12.37 dBi (free space)
Front-to-back ratio (F/B): 23.96 dB
Polarization: horizontal
SWR: 1.1:1 – 1.5:1
Impedance: 50 Ohms
Maximum power: 5,000 W PEP
Boom length: 16.73 ft / 5.10 m
Turning radius: 8.66 ft / 2.64 m
Overall height: 4.59 ft / 1.40 m
Weight: 22.05 lb / 10 kg
Wind survival: > 93 mph / > 150 km/h
12.37 dBi with 6 Long-Spaced Elements
The BIG SIGNAL 6BS-4 combines 12.37 dBi of gain with a 23.96 dB front-to-back ratio, providing the directivity and rejection required for DX and weak-signal operation on 70 MHz.
Construction and Materials
• Boom-to-mast plate
Heavy-duty structural plate measuring 9.84 x 3.94 x 0.24 in / 250 x 100 x 6 mm, sized to provide a strong and stable connection between the boom and the mast mounting system.
• Boom
Constructed from 1.38 x 0.079 in / 35 x 2 mm square tubing, providing the rigidity required to maintain the correct geometry of all six elements.
• Spreader supports
Manufactured from 0.79 x 0.12 in / 20 x 3 mm angle profiles, forming the structural support system for the antenna elements.
• Fasteners and hardware
Made from W4 stainless steel, selected to provide high corrosion resistance and long-term durability in permanent outdoor installations.
• Fiberglass system
Reinforced 0.47 x 0.28 in / 12 x 7 mm fiberglass tubing with a UV-protective coating, designed to provide mechanical strength and long-term durability under continuous outdoor exposure.
• 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 feed through a 50-ohm coaxial line.
High Gain and Directivity for the 4-Meter Band.
BIG SIGNAL 6BS-4 – 6 long-spaced elements, 12.37 dBi of gain, a 23.96 dB F/B ratio and up to 5,000 W PEP for stations focused on DX and weak-signal operation on 70 MHz.
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