A mount must accurately and securely aim a dish towards any chosen satellite. Even slight movements might mean the difference between receiving a signal and its being off target, especially with small beamwidth, large dishes operating a Ku-band frequencies. A deviation of as little as one degree might cause a second satellite to be swept into view in some areas of the world. Pointing accuracy is not necessarily as important an issue when detecting DBS broadcast satellites that are spaced 6 degrees apart in Europe and 8 degrees apart in North American. Antennas as small as 30 cm with 3 dB beamwidths of 5.8 degrees can be successfully used. There are two principal classes of antenna mounts: azimuth-elevation (az-el) and "true" or "modified" polar mounts. While both az-el or polar mounts can be fitted with actuators to permit rapid and easy targeting of any satellite in the arc, tracking mechanisms for polar mounts are usually the most simple and inexpensive. Remote controlled movement of either type of mount should be considered if multiple satellites or if satellites in unstable orbits are to be received.