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The AMY experiment aims to measure the Microwave Bremsstrahlung Radiation (MBR) emitted by air-showers secondary electrons accelerating in collisions with neutral molecules of the atmosphere. The measurements are performed at the Beam Test Facility (BTF) of Frascati INFN National Laboratories and the final purpose is to characterize the process to be used in a next generation detectors of ultra-high energy cosmic rays (up to 10 20 eV). We describe the experimental set-up and the first test measurement performed in November 2011. the development of the atmospheric shower and on the sampling of the secondary particles of the shower at the ground. These two techniques are employed in the Pierre Auger Observatory (1), which covers an area of 3000 km 2 and consists of an array of Cherenkov detectors and a system of fluorescence telescopes. These telescopes, observing the longitudinal development of the showers, provide a calorimetric measurement of the energy and a reliable measurement of the depth of the shower maximum, which is an observable correlated with the mass composition of cosmic rays. The main limitation of these detectors is the reduced duty cycle (about 14%) as they can only operate during

We report on the measurement of microwave radio signals from air showers with the CROME (Cosmic Ray Observation via Microwave Emission) experiment. CROME is located in the center of the KASCADE-Grande air shower array. The radio signals of the CROME antennas are stored for each high- energy trigger from the KASCADE-Grande array and matched offline with the KASCADE-Grande data. After almost one year of data taking microwave signals have been observed for more than ten air showers.