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Since 2002, the CODALEMA experiment located within the Nançay Radio Observatory studies the ultra-high energy
cosmic rays (above 1017 eV) arriving in the Earth atmosphere. These cosmic rays interact with the component of the
atmosphere, inducing an extensive air shower (EAS) composed mainly of charged particles. During the development of the
shower in the atmosphere, these charged particles in movement generate a fast electric field transient (a few nanoseconds
to a few tens of ns), detected at ground by CODALEMA with dedicated radio antennas over a wide frequency band
(between 1 MHz and 200 MHz). The study of this electric field emitted during the shower development aims to determine
the characteristics of the primary cosmic ray which has induced the particle shower: its nature, its arrival direction and
its energy. After some theoretical considerations and a short description of the SELFAS simulation code, we will present
the CODALEMA experiment, its performances and main results. At last, we will show how the EAS radio-detection
technique could be used to observe very high energy gamma rays sources, with the NenuFAR radio telescope.
