A diagnosing method for phased antenna array element failures is proposed. The element excitation amplitudes and phases are reconstructed by a compressed sensing based approach. in which the radiated electric fields of the array are sampled by a single fixed receiving antenna. The diagnosing can be processed when the phased array is still in service. https://www.spidertattooz.com/Civil-Air-Patrol-Patch-National-Emergency-Services-Academy/