Twisted radio beams could untangle the airwaves - tech - 13 February 2009 - New Scientist

Swedish physicists propose that more information could be packed into a radio signal by encoding extra data in the twist of the wave, which is independent of the amplitude and frequency. The approach would require at least a tripole antennas so cellphones, that use dipole antennas, would not benefit. Instead, the technology could be used to communicate between cellphone towers.