Based on two low grazing angle simultaneously recorded out-of-plane bistatic and monostatic S-band sea clutter datasets, and covering bistatic angles from 30 • -120 • , we analyze the average normalized radar cross section (σ • ), and show that under the measurement conditions the ratio between σ • B and σ • M tends to a minimum around a bistatic angle of 90 • , particularly at horizontal polarization. However, the cross-polarized σ • was larger for the bistatic clutter at bistatic angles close to 90 • .