A radio telescope consisting of 27 dishes, each 25 metres (82 feet) in diameter, configured to carry out Earth rotation synthesis. Located at Socorro, New Mexico, it is the world's largest aperture synthesis telescope. It elements are arranged in a Y-shape with three arms each 21 kilometres (13 miles) long. The dishes are connected electronically so as to be equivalent to 351 radio interferometers observing simultaneously. The maximum resolution obtainable is 0.05 arc seconds at a wavelength of 1.3 centimetres, although in practice most observations are made at 6 centimetres with 1 arc second resolution as this greatly reduces the time needed to construct a radio map.