  We report on the design and the expected performance of a low cost hybrid
detection system suitable for operation as an autonomous unit in strong
electromagnetic noise environments. The system consists of three particle
detectors (scintillator modules) and one or more RF antennas. The particle
detector units are used to detect air showers and to supply the trigger to the
RF Data acquisition electronics. The hardware of the detector as well as the
expected performance in detecting and reconstructing the angular direction for
the shower axis is presented. Calibration data are used to trim the simulation
parameters and to investigate the response to high energy ($E>10^{15} eV$)
extensive air showers.
