Pulse compression was used to improve both the gain and resolution of the dish antenna. Reception of the service signals uses a fixed 65-cm diameter dish antenna. Previously, Side A typically included a dish antenna. DirecTV typically uses a fixed dish antenna to receive its signals. A radio dish antenna for communications was also attached to the side of the cylinder. The Haystack Auxiliary Radar (HAX) is Ku-band system with a dish antenna. An offset dish antenna or off-axis dish antenna is a type of parabolic antenna. A despun dish antenna provided S and X band communication with Earth. A large high-gain dish antenna was attached to the base. For example, a dish antenna can be arrayed with a 34-meter dish. A K-band dish antenna provides a 100 Mbit/s science downlink. The 20-meter dish antenna in Bochum Observatory, Germany, would be a support station.