English: View of 70m (230 ft.) spacecraft communication antenna at the Canberra Deep Space Communication Complex, located outside Canberra, Australia. It is one of the three complexes which comprise NASA's Deep Space Network. The other complexes are located in Goldstone, California, and Madrid, Spain. This is a parabolic antenna with Cassegrain feed. It operates on X band (8 - 12 GHz) with extremely high gain of about 70 dBi. The incoming microwaves bounce off the large dish and are focused on the small white convex secondary reflector, which reflects them into the feed horn at the center of the dish. The receiver uses extremely low noise amplifiers such as cryogenically cooled masers or parametric amplifiers to detect the faint signals from spacecraft in the outer reaches of the Solar System. The three flags in foreground are those of the nations hosting the three Deep Space Network sites.