Discussion
What contributes to the noise temperature of a receiving antenna?
Answer: B
Antenna noise temperature sums the brightness temperature of everything the pattern sees, sky through the main beam and warm ground through the side lobes and spillover, together with the contribution of ohmic loss in the structure. This is why a satellite dish pointed low at the horizon performs worse than one pointed high, and why side lobe control matters in radio astronomy. Receiver noise is added separately in the system noise temperature.
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