The device includes a base for supporting one or more vertical elements of a piece of street furniture, wherein the base can include two parts or pieces nested together, one over the other, with a lower part anchored to the ground while the upper part is nested against the other by a pair of flanges. The oscillator is preferably of superregenerative type and exhibits negative resistance for the received signal. Preferably, also an instantaneous sum of powers of all links used in the same cell is provided.