BIG SIGNAL CQ-70
Compact Full-Wave Monoband Antenna for 430–440 MHz
The BIG SIGNAL CQ-70 is a monoband closed-loop antenna specifically designed to deliver high performance on the 70 cm band, combining efficiency, compact dimensions, and extremely simple installation.
Its full-wavelength element operates without loading coils or traps and allows the antenna to be installed with either vertical or horizontal polarization, making it suitable for terrestrial communications, repeaters, beacons, LoRa systems, digital modes, and a wide range of UHF applications.
Band: 430–440 MHz
Type: Full-wave monoband closed loop
Polarization: Vertical or horizontal
Size: Extremely compact
Matching: No loading coils or traps
Installation: Quick and easy
Recommended Use: Terrestrial communications / repeaters / beacons / LoRa / digital modes
What Makes the CQ-70 Different?
• Full-Wave Element for the 70 cm Band
The CQ-70 uses a full-wavelength closed-loop element designed for high electrical efficiency without the need for loading coils, traps, or other loading systems.
• Vertical or Horizontal Polarization
Polarization can be selected during installation, allowing the CQ-70 to be configured according to the type of communication and radiation pattern required by your station.
• Closed-Loop Design for Cleaner Reception
Its closed-loop geometry can provide a favorable signal-to-noise ratio against certain types of electrical interference, an especially useful advantage when receiving weak signals.
• Compact and Low-Profile
Its small dimensions make it ideal for low-profile installations on balconies, terraces, rooftops, compact masts, and locations where a conventional antenna would be too large or visually intrusive.
• Versatile UHF Performance
An especially practical solution for terrestrial communications, repeaters, beacons, digital modes, and LoRa systems, as well as other applications within its operating frequency range.
• Quick Installation
Its straightforward design makes installation fast and easy, providing a dedicated 70 cm monoband antenna without complex adjustments after installation.
A Compact Alternative to a Traditional Vertical
The CQ-70 is designed for operators looking for an efficient 70 cm antenna without necessarily relying on a conventional vertical. Its combination of a full-wave element, closed-loop geometry, and selectable polarization provides an exceptionally versatile solution in a very compact package.
• Full-wave element.
• No loading coils or traps.
• Vertical or horizontal polarization.
• Favorable signal-to-noise ratio.
• Compact, low-profile design.
• Specifically optimized for 430–440 MHz.
Full-Wave Performance. Minimal Size. Maximum Versatility.
BIG SIGNAL CQ-70 – a compact monoband antenna designed for operators looking for performance, simplicity, and installation flexibility on the 70 cm band.
Technical Specifications
• Band: 430–440 MHz
• Gain: 3.2 dBi (Free Space) | 8.63 dBi @ 6 m / 19.69 ft
• Polarization: Vertical or horizontal, selectable during installation
• Radiation Pattern: Omnidirectional (vertical polarization) | Bidirectional (horizontal polarization)
• SWR: 1.1:1–1.5:1
• Impedance: 50 Ohms
• Maximum Power: 1,000 W PEP
• Total Height: 0.25 m / 9.84 in
• Total Width: 0.25 m / 9.84 in
• Weight: < 1 kg / 2.20 lb
• Wind Survival: > 200 km/h / 124 mph
• Wind Load: 0.041 m² / 0.44 ft² | 31.79 N / 7.15 lbf | @ 120 km/h / 74.6 mph
Two Polarizations. Two Radiation Patterns.
The BIG SIGNAL CQ-70 can be installed with either vertical or horizontal polarization. In the vertical configuration, it provides an omnidirectional radiation pattern, while the horizontal configuration produces a bidirectional pattern, allowing the antenna to be adapted to the desired type of communication.
Construction & Materials
• Mast Mount: U-bolt clamp for masts up to 50 mm / 1.97 in
• Boom: 25 x 2 mm / 0.98 x 0.08 in square profile
• Hardware & Fasteners: W4 stainless steel
• Fiberglass System: 8 x 4 mm / 0.31 x 0.16 in reinforced fiberglass tubing with UV-protective coating
• Wire: BIG SIGNAL Wire, special copper wire with a polyethylene (PE) jacket for excellent weather protection and high mechanical strength
• Feed Connection: Type-N connector
Just 9.84 x 9.84 Inches. Much More Than a Compact Antenna.
With a full-wave element, selectable polarization, and dimensions of just 0.25 x 0.25 m / 9.84 x 9.84 in, the BIG SIGNAL CQ-70 delivers an excellent combination of performance, versatility, and minimal visual impact on the 70 cm band.
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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