Composite dynamic spectrum of a complex radio event at low frequencies (1–260 MHz) on 28 March 2022. The dynamic spectrum consists of spectra from STEREO-A/WAVES, eCALLISTO Birr, eCALLISTO Humain, and ORFEES. The labels “F” and “H” refer to fundamental and harmonic emission, respectively. The white light curve overlaid on the ORFEES spectrum represents the Fermi GBM HXR count rate at 25–50 keV.