Introduction
The document introduces the Leica AR25, a revolutionary 4 constellation GNSS antenna designed to set new standards in low elevation tracking and multipath reduction. It emphasizes the durability and precision of the design, drawing a parallel to the enduring construction of the Egyptian pyramids.

Technical Specifications
The Leica AR25 features a Dorne-Margolin antenna element with a 3D choke ring ground plane. It tracks signals from GPS, GLONASS, Galileo, and Compass systems, as well as L-Band signals. The antenna dimensions are 380 mm x 200 mm, with a weight of 7.6 kg. It operates within a supply voltage range of 3.3 – 12 VDC and has a nominal impedance of 50 ohms. The gain is typically 40 dBi, with a noise figure between 0.5 – 1.2 dBi. It can operate in temperatures from –55° C to +85° C and is protected against environmental factors such as humidity, rain, dust, and sand, with an IP67 rating.

Design and Performance
The AR25's innovative 3D choke ring design enhances the traditional 2D design, offering superior multipath rejection and low elevation tracking. It uses an ultra-wideband Dorne-Margolin element, optimized for use with most geodetic receivers. The antenna is suitable for various applications, including reference stations, monitoring, seismic studies, and atmospheric studies.

Future-Proofing
The AR25 is designed to accommodate all existing and planned signals from global navigation satellite systems, aligning with Leica Geosystems' "future proof" philosophy. This ensures compatibility with emerging systems like the European Galileo and Chinese Compass (Beidou) systems.

Conclusion
The Leica AR25 is a robust, high-performance antenna built to withstand harsh environments and meet the demands of modern geospatial applications. It represents a significant advancement in choke ring antenna technology, ensuring reliability and precision for future satellite tracking needs.