Near-field antenna measurement methods make use of a measuring probe to detect the complex (magnitude and phase) electric field radiated by the antenna under test. When the phase of the near-field is impractical to be obtained, or when it is obtained with low cost equipment, a process for recovering or filtering the phase is needed. In this Lecture an iterative algorithm that has been initially used in the field of Optics is presented but applied to phaseless antenna near-field measurements.