Hybrid through-air telecommunication system protected against outages

A hybrid through-air telecommunication system of a radio/optical type is described which significantly reduces the annual unavailability caused by weather events and/or faults. The hybrid optical and radio system further permits, given an annual availability value, of significantly increasing the maximum link distance if compared with the full radio or full optic systems. The changeover in reception occurs on the basis of the power values of the received signals.