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The significance of scattering cross section and back-scattering cross section in terms of antenna current distribution is considered. In particular, the influence of antenna load impedance on the magnitude and directional pattern of the scattered radiation is pointed out. A measuring scheme is described which utilizes the standing waves set up by energy reflected toward the transmitter from any receiving antenna or parasite. This method permits direct study of the back-scattering from loaded and unloaded antennas. Approximate scattering data for several types of antennas are included.