Overview of the radio and X-ray emissions associated with the GLE on 2021 Oct. 28. Top: dynamic spectrogram in the range 1–5000 MHz observed by EOVSA, ORFEES, the e-Callisto station at Birr Castle (Ireland), and Wind/WAVES/RAD2. Middle: EOVSA light curves at four microwave frequencies. Bottom: solar Orbiter/STIX light curves in thermal (black) and non-thermal (red) X-rays. The vertical dashed lines delimit three numbered intervals of DH type III bursts.