Discussion
An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern
Answer: C
When an antenna receives, its radiation pattern is the same as when it transmits. This follows from the reciprocity theorem, which says that the properties of an antenna, including its directivity, gain, impedance and pattern, are the same whether it is used for transmitting or receiving, as long as the medium is linear and isotropic. So a highly directional transmitting antenna is equally directional when receiving. The option that it is more directive or less directive when receiving, and that it exhibits no directivity, would each break reciprocity. The answer is that its pattern is the same as that of the transmitting antenna.
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