The Gain Flex UHF External Antenna (also commonly referred to as the Gainflex or GAT series) is a high-performance, flexible whip antenna designed specifically for GNSS RTK receivers and external radio modems. It is the "gold standard" for surveyors who need to maintain a robust data link between a base station and rover in challenging environments.

Product Overview

In the world of RTK surveying, the UHF radio link is your lifeline for centimeter-level accuracy. The Gain Flex antenna is engineered to maximize signal gain while remaining resilient to the physical rigors of field life. Its unique "Flex" design allows the antenna to bend when encountering obstacles like tree branches or vehicle hatches, preventing the snapping or connector damage common with rigid antennas.

Key Features

• High-Gain Performance: Engineered with a 5.5 dBi gain (typically), significantly extending the communication range compared to standard 0 dBi "stubby" antennas.

• Flexible "Gainflex" Construction: Built with a memory-alloy or high-tensile polymer core that allows the antenna to flex up to 90 degrees and snap back to its original vertical position.

• Frequency Tuned: Available in specific sub-bands for maximum efficiency:

  • 400–435 MHz (Common for GAT1/Gainflex models)

  • 435–470 MHz (Common for GAT2/Gainflex models, widely used in Kenya)

• Rugged TNC Connector: Features a heavy-duty, gold-plated TNC male connector that ensures a weatherproof and vibration-resistant seal with your FOIF, Leica, or South GNSS receivers.

• No Ground Plane Required: Optimized to operate efficiently even when mounted on a carbon fiber survey pole without a large metal reflecting surface.

• Weatherproof Shroud: Encased in a UV-resistant, heat-shrinkable tubing that protects the internal coils from dust, rain, and the intense sun of tropical climates.

Technical Specifications

Why It’s Essential for Your Workflow

If you are working in areas with heavy canopy or undulating terrain, a low-gain antenna will often result in "Radio Link Lost" errors in your data collector. Upgrading to a Gain Flex UHF Antenna ensures that your RTK corrections reach your rover consistently, allowing you to maintain a "Fixed" solution and keep your project moving.

In the Box:

• 1x Gain Flex UHF External Radio Antenna (TNC Connector)