The variation in echoing area of a 1/20-scale F-80 aircraft with changing direction of linear polarization has been studied at 9000 mc. For a range of aspects 40 degrees to either side of nose on, in a horizontal plane, power patterns were obtained for polarizations at 0, 15, 30, 45, 60, 75 and 90 degrees inclined to the horizontal. Several patterns of the return from a 1/10- scale F-80 aircraft at 9000 mc have been obtained for ordinary and cross- polarized components of echo. Representative patterns illustrating the variation in ehco area with direction of linear polarization have been obtained from simple targets. Analysis of these patterns is discussed.