Abstract: An Antenna Positioning System for missile seeker and system development and test comprises an antenna module, and a plurality of tethers, wherein the antenna module is suspended in a position by the tethers and the position is capable of being changed and the antenna module manoeuvred by pulling at least one tether and simultaneously releasing at least one tether. The system is useful for testing and developing Radio Frequency (RF) missile technology in a controlled, simulated environment rather than by live missile firings.