Our ANT-C2GA-TW-N (formerly ANT-533) is an active fixed reference antenna designed to operate at the GPS L1 and L2 frequencies, 1575.42 and 1227.60 MHz. Its rugged, low profile construction makes it ideal for reference stations, geological monitoring and other applications requiring a robust high performance antenna.Features Stable phase center Aluminum alloy constructionBenefits High precision measurements Rugged construction delivers reliable performance even in harsh environments