This contribution presents an isotropic magnetic field probe with shaped frequency response in the band 100 kHz - 400 MHz to ponder the aggregate response according to the ICNIRP 2020 guidelines. The basic sensor is a printed loop which is modelled as a Thévenin source obtained through full-wave simulation. A canonical filter is optimized considering the frequency response of the equivalent source, the detector and the desired transfer function. Finally, a cubic arrangement of three elementary sensors is used to assess the isotropy and isolation of the probe.