This article is devoted to creation of the secondary network using base stations of mobile telecommunications operators. General advantages of the secondary networks are discussed. Then we suggest to build a novel network of low-cost small base radars (BSR) by adding the low-power radars to the existent selected base stations’ equipment. This gives a possibility to obtain a high-resolution meteorological information in particular about dangerous weather phenomena in real-time and for any region of mobile network coverage. The applications of the proposing network are not limited by meteorology, but includes also some other fields, for example, traffic monitoring, birds and insects’ migration observations, etc.