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A detailed analysis is made of a laterally displaced interrogator sidelobe suppression (SLS) radar beacon antenna system. This method is recommended as a very economical solution to the FAA requirement for installing interrogator SLS capability at operating beacon systems where no provision had been made for interrogator SLS. The analysis was verified by an actual field test at a joint use (Department of Defense/Federal Aviation Agency) radar site at Sault Ste. Marie, Mich. Sidelobe suppression was practically complete and neither time displacement nor blockage was discernible as predicted by the analysis.