The initial ALMA array is composed of 66 high - precision antennas .
The initial ALMA array is operates at wavelengths of 9.6 to 0.3 millimeters ( 31 to 1000 GHz ) .
The initial ALMA array is composed of 66 high - precision antennas , and operates at wavelengths of 9.6 to 0.3 millimeters ( 31 to 1000 GHz ) .