Feed Point Boxes, Why?

Feed Point Boxes, Why?


The intricacies of VHF/UHF Yagi antenna design are notably influenced by real-world implementation choices, with the feed point box playing a pivotal but negative role. Many software models overlook this component, leading to predictions that are not a true representation of what the end-user experiences. Not only does it retain moisture over time, but its presence also distorts the antenna pattern, influences the noise figure, and ultimately degrades the G/T performance. This degradation contrasts sharply with the model's predictions if the feed point box was omitted. The only discernible benefit of the box is aesthetic, making the Yagi appear more polished.

InnovAntennas confronts these challenges head-on. We prioritise the use of RF-friendly materials and design with minimal supporting structures. We avoid feed point boxes entirely, sidestepping their associated problems. Instead, we employ a direct connection using small, durable user-serviceable connections. This ensures longevity. Additionally, it offers users easy maintenance without the need for proprietary parts from InnovAntennas. Our Yagis strike a harmonious balance between the perfection of a software model and the practicalities of real-world construction, delivering industry-leading performance by setting new standards in real-world model replication.

For those who aim for the apex of low-noise performance, with a steadfast commitment to design integrity and longevity, the low noise LFA Yagi stands unmatched.  we've completely eliminated the traditional feed point box, commonly susceptible to moisture retention and the ensuing performance deterioration. This deliberate engineering choice ensures a moisture-free, low-loss, low noise connection - a feature notably absent across the industry and one that ensures our G/T results are closer to predicted noise figures than anyone else. Our approach safeguards against the common pitfalls of water ingress, which can lead to tuning fluctuations and potential transceiver damage from impedance discrepancies. The LFA Yagi offers a universal pillar of dependability and superior performance in any environment, catering to those who prioritise peak performance without compromise.

FM5CS X pol A

4 x 20el 144MHz low noise LFA Yagis at FM5CS - Perfectly centred elements and absolute minimal supporting structures around the antenna to ensure modelled pattern replication.


For enthusiasts seeking unrivalled low-noise performance, the low noise LFA Yagi from InnovAntennas stands as a paragon of excellence. Our innovative design approach centres on more than just avoiding moisture; it vitally focuses on preventing the detrimental shrouding of the dipole, the Yagi's most vital component. Conventional feed point boxes, commonly found in traditional designs, cover a significant part of the dipole's centre, inadvertently inducing noise and degrading both the noise figure and the G/T performance. Discarding this standard approach, the LFA Yagi delivers an unobstructed, low noise experience, ensuring that the antenna's real-world performance closely mirrors the optimised theoretical models. This dedication to design integrity propels the LFA Yagi beyond conventional limitations, offering an experience unparalleled for the discerning operator.

Justin G0KSC - InnovAntennas

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