A portion of the large Adelaide MF/HF antenna array has been used in conjunction with a new, 25 kW solid-state transmitter to conduct electronic beam-steering experiments. Thirty of the array's refurbished, independently phased antennas were connected to the 10 power amplification (PA) modules in groups of three to form a steerable beam with a one-way half-power half width of 5¿. Phase propagation errors in the receivers were determined and used to enable accurate direction-finding and interferometric studies to be conducted. In this paper, new methods of determining the aspect sensitivity of backscatter and the three-dimensional linear wind field in the mesosphere and lower thermosphere (60--100 km) are introduced. ¿ American Geophysical Union 1995