Federal guidelines found in Title 47, Part 15, Section 15.204 authorize use of third-party antennas. Specifically, Section 15.204 says:  "Any antenna that is of the same type and of equal or less directional gain as an antenna that is authorized with the intentional radiator may be marketed with, and used with, that intentional radiator. No retesting of this system configuration is required. The marketing or use of a system configuration that employs an antenna of a different type, or that operates at a higher gain, than the antenna authorized with the intentional radiator is not permitted."