A failures detection system (1) of a plurality of transmitting antennas of television and/or radio signals. The system includes a power divider splitting a television and/or radio signal (STV) to a plurality and antennas, and a plurality of directional couplers and of signal concentrators that send a multiplexed signal containing information on the SWR, power, and environmental parameters to a processing module (22) configured to process the multiplexed signal generating diagnostics and warning signals.