However, if the receiver antennas are placed too closely together, it is almost as if there is only one antenna. The basic rule is to have spacing of at least one wavelength (about a foot at UHF ...

Partnering with the U.S. Coast Guard Navigation Center (NAVCEN), U.S. Space Force and Lockheed Martin Space have released the GPS IIR/IIR-M satellite antenna patterns for worldwide public use.