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BIG SIGNAL 12BS-70
Next-level UHF performance in a compact boom.
BIG SIGNAL is proud to introduce the latest generation of high-performance cubical quad antennas for the 432 MHz / 70 cm band. The BIG SIGNAL 12BS-70, with its 12 long-spaced elements, is one of our best-selling UHF models, known for delivering exceptional performance in a surprisingly compact boom.
Why choose a cubical quad over a traditional Yagi in UHF?
• Full-wave design on 70 cm
Unlike Yagis that operate on half-wave elements, this antenna uses true full-wavelength elements, maximizing efficiency and signal strength across the band.
• More gain in less boom
The BIG SIGNAL 12BS-70 achieves higher gain with a shorter boom than similarly sized Yagis—ideal for compact towers and limited-space installations.
• Extremely low noise reception
The closed-loop design dramatically reduces QRN and urban RF noise, helping you detect and decode the weakest signals even in high-noise environments.
• Lower sensitivity to polarization mismatch
Cubical quads are less affected by cross-polarization than Yagis, meaning less signal fading (QSB) and more reliable reception of signals with varying polarizations—perfect for satellite ops, Greencube, and EME (moonbounce).
• High directivity and selectivity
Outstanding side and rear lobe suppression reduces interference from unwanted directions, allowing for sharper, more focused operation.
• Fast and easy installation
Preassembled elements and tool-free mounting get you on the air quickly and effortlessly.
The urban noise solution for serious UHF DXers
As urban RF noise continues to rise, cubical antennas offer a real solution. The BIG SIGNAL 12BS-70 is built to cut through the noise, isolate the signal, and maximize your DX capabilities on 432 MHz.
BIG SIGNAL – Where V-UHF performance reaches its peak.
Upgrade to the 12BS-70 and hear the difference.
Specifications:
· Band: 430 ~ 440 MHz.
· Active elements: 12 (wide space).
· Gain: 15,13 dBi. (free space).
· F/B: 24,02 dB.
· Beamwidth 3 dB: 32º
· SWR: 1,1:1 ~ 1,5:1.
· Impedance: 50 Ohm.
· Power rating: 5.000 W. PEP
· Boom length: 2,04 m. / 3,937 ft.
· Turning radius: 1,07 m. / 3,51 ft.
· Total height: 0,17 m. / 0,557 ft.
· Weight: 1,8 Kg / 3,968 lb
· Wind survival: > 200 Km/h. / 125 mph.
· Wind load: 0,054 m2 | 42,70 N | @120 km/h.
Construction details:
· Fastening to mast: Clamp up to 50 mm.
· Boom size: Square aluminum of 20 x 2 mm / 9,84 in.
· Hardware: Stainless Steel, W4 grade.
· Spreaders Arms: 8 x 4 mm reinforced fiberglass tube with UV protection layer.
· Cable: BIG SIGNAL - Wire. Special copper cable with polyethylene (PE) sheath for excellent weather protection and mechanical resistance.
· Feeding: N type connector.
Reviews
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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.
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Mi idea era poner una antena para VHF y UHF para iniciarme un poco en estas bandas, no queria unas antenas muy grandes y aparatosas, pero si queria que tuviesen un gran rendimiento, por lo menos el mejor posible, en un tamaño comedido. Despues de dar muchas vueltas, buscar información y comentarios, me he decidido por una 8BS-2 y 12BS-70.
Las antenas estan mecanicamente perfectas, muy sencillas de montar y seguro que daran buenos dias de entretenimiento y DXs.
Nos escuchamos desde IN73DL.
When IO-117 covers the United States, I usually can't hear it until it's at least 10 degrees elevation. And I usually can't hit the satellite on transmit until it's nearly 20 degrees. With the new antenna, I heard and hit the satellite at about 3 degrees elevation.
Tengo esta antena, para satelites especialmente, y la verdad va de fabula, tiene muy buena oreja.. Excelente!!
Hi my name is Marco. I bought this model for curiosity quad antenna Compared yaghi 16 elements boom 3 meters. In most cases the received signal is the same. in my opinion, the positive sides are: low noise, less boom lenght , better f/b and back then yagi good construction. The attention of the manufacturer in providing work gloves was greatly appreciated
Muy contento con la 12bs70, muy sencilla de montar, materiales de excelente calidad y una atencion al cliente de 10 por parte de Big Signal.
Al igual que su hermana de 2m es una antena con un montaje muy sencillo, en apenas 10 minutos la puedes tener operativa, con materiales de muy buena calidad y un manual de instrucciones muy detallado.
Al principio te sorprende el bajo ruido, parece que no tengas antena instalada, tiendes a subir el volumen de tu emisora y cuando de golpe te llama alguien y te entra con un s9 te pegas un susto que te caes de la silla jajaja.
Antena con un patron de radiacion muy directivo, cuando la enfocas hacia tu corresponsal es una delicia tanto emitir como recibir, la uso tanto en ssb terrestre como en sat (polarizacion horizontal) con resultados muy satisfactorios con contactos en fonia ssb a unos 300km sin ninguna dificultad (a la espera de probarla con un previo de rx para sats).
Al igual que su version de 2m roe totalmente plana en toda la banda.