  We have shown experimentally that it is possible to propagate and use the
properties of twisted non-monochromatic incoherent radio waves to
simultaneously transmit to infinity more radio channels on the same frequency
band by encoding them in different orbital angular momentum states. This novel
radio technique allows the implementation of, at least in principle, an
infinite number of channels on one and the same frequency, even without using
polarization or dense coding techniques. An optimal combination of all these
physical properties and techniques represents a solution for the problem of
radio band congestion. Our experimental findings show that the vorticity of
each twisted electromagnetic wave is preserved after the propagation, paving
the way for entirely new paradigms in radio communication protocols.
