The satellite dish, known as the cauldron, is a metal paraboloid that reflects the satellite signal to the feed and high-frequency head at the focal point. The purpose of a satellite dish is to collect weak signals from the satellite and remove as much noise as possible. Most antennas are usually parabolic, and some multifocal antennas are made of a combination of a sphere and a paraboloid. The satellite signal is reflected off the parabolic antenna and concentrated at its focal point.