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161,16 € (195,00 € TAX Inc.)
119,83 € (145,00€ TAX Inc.)
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At BIG SIGNAL, we're always committed to providing you with the latest in ham radio technology, and today we're excited to introduce our latest innovation for portable operations: the BIG SIGNAL DeltaFlex antenna.

The DeltaFlex is much more than just an antenna; it's a genuine revolution in the world of ham radio and antennas for portable expeditions, suitable for SOTA, POTA, or any other type of expedition. Designed with the needs of adventurous ham radio enthusiasts in mind, the DeltaFlex offers exceptional performance and unparalleled flexibility. Here are some reasons why the DeltaFlex stands out:

- Flexibility in its DNA: The DeltaFlex has been designed with adventurous ham radio operators in mind. With the ability to vary height, width, angle, and installation position, this antenna provides unparalleled flexibility to adapt to any environment and challenge you may encounter.

- Band versatility: From the exciting 40-meter band to the 10-meter band, the DeltaFlex allows you to select the working band you need at any time. A complete solution for all your portable operation needs.

- Stress-free installation: With just a 6 to 7-meter mast, DeltaFlex installation is quick and straightforward. Being on the air within minutes is a reality, without unnecessary complications.

- Power and resilience: With the ability to handle up to 300 W. of power, this antenna is robust and reliable, ideal for confidently facing challenges in the mountains. Moreover, its weight of only 500 grams makes it very light to transport.

Why the BIG SIGNAL DeltaFlex antenna is the number one choice for your portable outings:

· Unmatched performance: Unlike other half-wave antennas like end-fed or dipoles, the DeltaFlex operates at a full wavelength on 40 meters and is resonant on 20, 15, and 10 meters. This results in superior performance and gain, allowing you to establish highly efficient QSOs on multiple bands.
· Very low noise: Thanks to its closed-loop design, this antenna minimizes QRM and noise, providing clear reception free of interference, even in noisy environments.
· Limitless DX: With its vertical polarization and low radiation angle, the DeltaFlex allows you to reach further in your DX communications, overcoming propagation challenges and exploring new horizons.
· Simplified operation: Unlike other antennas, the DeltaFlex eliminates the need for an antenna tuner, simplifying your operations and saving you valuable time in setting up your portable station.

The BIG SIGNAL DeltaFlex is not just an antenna; it's your perfect companion in your ham radio adventures. With its exceptional flexibility and superior performance, it will exceed your expectations and provide reliable operation in any environment.

Are you ready to elevate your DX experience in portable operations? The BIG SIGNAL DeltaFlex is here to make it possible!



· Bands: 40 / 20 / 15 / 10 meters (Selectable).
· Gain: 3.2 dBi (Free space).
· Polarization: Vertical.
· SWR: 1.1:1 ~ 2.0:1
· Maximum Power: 300 W. PEP.
· Total Width: 16 ~ 18 meters / 52.49
 ~ 59.06 ft.
· Minimum Required Mast Height: From 6 meters / 19.69 ft
· Weight: 500 grams. / 1.10231 lb 
· Wind Resistance: > 200 km/h. / 124.27 mph


· Mounting: Consists of 2 fiberglass insulators that, when tensioned with insulating cord, shape the antenna.
· Cable: BIG SIGNAL - Wire. Special copper cable with polyethylene (PE) sheath for excellent weather protection and mechanical resistance.
· Feed: PL-UHF.


  1. Jose David (NP3JD) (NP3JD)29 Ene, 2024 - 10:59

    He tenido la oportunidad de probar la antena durante aproximadamente una semana y los resultados han sido altamente satisfactorios. Esta antena, diseñada para uso flexible tanto portátil como en base, abarca las bandas de 10, 15, 20 y 40 metros. Su instalación ha sido un éxito, logrando un montaje firme con un mástil de al menos 35 pies (11 metros) y vientos.

    Lo notable es que no se requiere un sintonizador adicional; simplemente cambiando la banda mediante el conmutador de la antena, evitas la necesidad de utilizar equipos adicionales. La antena es liviana y presenta terminaciones muy profesionales. La he instalado de forma independiente y he podido trabajar varios DX en distintos modos como CW, RTTY, FONIA y FT4 en las diversas bandas, ya sea con 100 watts o con un amplificador (HLA 300 Black RM Italy).

    Lo más impresionante es la calidad del sonido de recepción: nítido y prístino. En algunas ocasiones, he logrado ingresar a pile-ups con informes positivos. Esta antena resulta perfecta para actividades como POTA, BOTA, Field days, y otras situaciones donde se requiera una antena multibanda práctica, liviana, flexible y fácil de montar. Una vez sintonizada cerca de los 7.100 MHz, las demás bandas quedan afinadas automáticamente.

    En resumen, después de una semana de pruebas, la antena ha demostrado mantener consistentemente buenos resultados en DX y ha recibido excelentes informes. Comparto un enlace a un QSO entre Puerto Rico y España (EA5CCY) en fonía 20m: [enlace del video](https://youtu.be/FQXGEe8u0cU?si=k7D4UFr9vRzkW93O).

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QSO between NP3JD and EA5CCY using the BIG SIGNAL DeltaFlex.

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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