This process is adapted for at least two groups of antennas (4, 6). A modulated signal is emitted by a first group of antennas (4) whilst the antennas (6) of a second group emit a similar modulated parasitic signal but of less amplitude....http://www.google.com.au/patents/US6828900?utm_source=gb-gplus-sharePatent US6828900 - Process for controlling antennas
