Discussion
Why is a low-noise amplifier sometimes mounted at the antenna?
Answer: B
Feeder loss adds directly to the system noise figure if it comes before the gain, so placing the amplifier at the antenna puts the gain ahead of the loss and the Friis formula then divides the loss's contribution. Radiation pattern is fixed by the antenna's geometry. Standing wave ratio depends on matching. And power flows the other way, up the feeder to the amplifier. Where a stage sits in the chain can matter as much as how good it is.
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