Also found this: > Signals received from GNSS Satellites are usually very weak and are thus susceptible to deliberate or unintentional interference. It is very

Also found this: > Signals received from GNSS Satellites are usually very weak and are thus susceptible to deliberate or unintentional interference. It is very easy for an adversary to intentionally introduce RF interference into the GPS frequency bands, referred to as jamming, and deny the user position, navigation, and timing (PNT) data. Using CPRA antennas can help protect against this changing the antenna reception patterns to null out the jamming signals and direct the beams towards the satellites. https://www.everythingrf.com/community/what-are-controlled-reception-pattern-antennas https://www.everythingrf.com/community/what-are-controlled-r... And another article which gives an overview of how controlled reception pattern antennas work (CRPA): https://www.gpsworld.com/anti-jam-technology-demystifying-the-crpa/ https://www.gpsworld.com/anti-jam-technology-demystifying-th...