Discussion
What is a mismatch uncertainty in an antenna measurement?
Answer: A
When two components are imperfectly matched, multiple reflections between them add to the signal with an unknown phase, so the measured level has an uncertainty set by the product of the two reflection coefficients. Attenuators between them reduce it. The other options describe the antenna's own impedance, a specification comparison and a calibration error. An uncertainty arising from the interaction of two components, rather than from either alone, is easy to overlook in a budget.
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