The effective radar signature of ground or sea objects is determined not only by its free-space radar cross section but also by its interaction with the environment through multiple scattering. In order to predict this interaction data on bistatic scattering properties of the ground (sea) surface is required. It is customary to make a distinction between specular and diffuse ground scattering. This study is focused on the measurement of the latter, for which bistatic data is still scarce. Compared to regular monostatic measurements of object cross sections additional aspects need to be considered i.e. the geometry is bistatic and the ground surface is, in principle, infinite. Due to this antenna tapering corrections are always needed and the radar needs to be moved around. Starting from potentially relevant ground scattering geometries the study concentrates on identifying the special requirements for measurements of this kind and on finding possible solutions. The problems mentioned may for example be partly circumvented by using an auxiliary reflector. Finally the pros and cons of some plausible measurement setups are investigated.