Mills cross antenna

Mills cross antenna

An interferometer (see radio telescope) using two long narrow antennas mounted in the form of a cross and producing a single pencil beam; it is named after B.Y. Mills, who constructed the first one near Sydney. One arm of the cross may be shortened to give a T-antenna , which has an antenna pattern very similar to that of the full cross but whose sensitivity is less.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006