A concentric arrangement of multiple spacecraft antennas mounted symmetrically about the yaw axis of rotation or center of gravity of the spacecraft that provides the capability for spacecraft with multiple antennas to maneuver without introducing errors into navigation signals and without adding complexity...http://www.google.co.uk/patents/US7050019?utm_source=gb-gplus-sharePatent US7050019 - Concentric phased arrays symmetrically oriented on the spacecraft bus for yaw-independent navigation
