  Codalema is one of the experiments devoted to the detection of ultra high
energy cosmic rays by the radio method. The main objective is to study the
features of the radio signal induced by the development in the atmosphere of
extensive air showers (EAS) generated by cosmic rays in the energy range of 10
PeV-1 EeV . After a brief presentation of the detector features, the main
results obtained are reported (emission mechanism, lateral distribution of the
electric field, energy calibration, etc.). The first studies of the radio wave
front curvature are discussed as new preliminary results.
