A method, system and apparatus (20) for compensating for non-ideal isotropic behavior of a field probe (10) are disclosed. A method includes, during a calibration procedure, for each of a plurality of positions of the field probe relative to a source, each position denoted by a set of angles (θ, φ), performing the following steps: measuring a (S 102) field by the sensors of the probe, storing (102) the measurements and the set of angles (θ, φ) for each measurement, computing (S104) a correction factor for the set of angles (θ, φ) based on the measurement, and storing (S104) the correction factors. During a measurement procedure, each sensor measures (S108) a component of the field. A set of angles is determined based on the sensor measurements, and a correction factor is determined based on the set of angles. The correction factor may then be multiplied by the sensor measurements to obtain the corrected field measurements.
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