Discussion
What is the reciprocity theorem as applied to antennas?
Answer: C
Reciprocity means an antenna's radiation pattern, gain, impedance and polarisation are identical whether it is transmitting or receiving, which is why patterns can be measured in whichever direction is convenient. The exception is any antenna containing a non-reciprocal component such as a ferrite isolator, and power handling obviously differs. The other options misuse the word reciprocal in its arithmetic sense, which is not what the theorem is about.
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