Backscatter measurements were made, at frequencies of 0.5, 1.0, and 1.5 MHz, of waves scattered from three different targets: (1) an inhomogeneous medium with a plane boundary, (2) a homogeneous medium with a rough boundary, and (3) an inhomogeneous medium with a rough boundary. The surface roughness of targets 2 and 3 is the same and so are the inhomogeneous properties of targets 1 and 3. It is found that for the cases studied surface roughness is more sensitive to frequency than the inhomogeneities and that the inhomogeneities contribute more significantly to the backscattered power at large incident angles than surface roughness.