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As a supplement to an earlier DSTO Technical Note, "Overview of STAP algorithms", this Technical Note examines processing of phased array data collected from non-side-looking geometries. Space-time adaptive processing (STAP) algorithms developed for the radar operating in the side-looking mode cannot in general be directly applied to radar operating in non-side-looking modes, including the forward-looking mode. A simple Doppler compensation scheme is described, so that the Doppler frequency of mainlobe clutter is shifted to zero and becomes range invariant, like the clutter data collected from the side-looking geometry. After Doppler compensation, all STAP algorithms developed for the side-looking geometry can be applied. Also briefly discussed are some techniques for suppression of range-ambiguous clutter, including so-called 3D STAP and frequency diversity technology.