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I am currently in the process of designing a dual band horn antenna for the frequencies 24.5 GHz and 37.5 GHz. This antenna will only be used as a receiver. My co-workers are proposing that a S11 is not that important when since the antenna is only used for receiving purposes, and not for transmitting. Doesn't having a poor return loss also mean poor sensitivity? Can someone explain how a poor S11 would effect the performance of my device in all aspects?