Novatel GPS/Galileo/GNSS L-Band Choke Horn Antenna

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The GNSS-750 is an active antenna designed to receive signals from the GPS, Galileo and GLONASS satellites as well as L-Band signals. The GNSS-750 uses a wideband choke ring antenna with 3D low profile design that optimizes low elevation signal tracking. https://en.wikipedia.org/wiki/Choke_ring_antennaThe GNSS-750 antenna is a fixed reference antenna that is optimized for the positioning accuracy and availability requirements of reference station applications. The Low Noise Amplifier (LNA) has a gain of 43 +/- 3 dB and a Noise Figure (NF) of 2 dB.The GNSS-750 antenna contains a choke-ring to reduce the strength of undesired reflected signals (multipath) that degrades positioning accuracy. Absolute and/or relative type calibration files are available for this antenna as well.This antenna is designed to operate for GPS L1/L2/L2C/L5, GLONASS L1/L2/L3 and L-Band frequency bands. The GNSS-750 is also designed to operate for Galileo L1/E5a/E5b and E6 frequency bands and receives Compass B1/B2/B3.This antenna is based upon a 'choke' horn design and more data on this antenna can be found here : https://novatel.com/products/gps-gnss-antennas/fixed-reference-gnss-antennas/gnss-750The Leica AR25 GNSS Choke Ring Antenna is also very similiar :https://leica-geosystems.com/en-us/products/gnss-reference-networks/antennas/leica-ar25There is a good paper titled "Antennas as Precise Sensors for GNSS Reference Stations and High-Performance PNT Applications on Earth and in Space" by Stefano Caizzone , Miriam Schönfeldt, Wahid Elmarissi, and Mihaela-Simona Circiu which describes the testing and use of this antenna for high accuracy locating and performance comparisons : https://www.mdpi.com/1424-8220/21/12/4192/htmBTW : this antenna reminds me of the navigational guidance system watching Lost-in-Space when I was growing up : https://www.youtube.com/watch?v=l4rDZhsgn9Q