Discussion
Which noise source would a directional antenna help against?
Answer: D
A directional antenna can null an external interferer arriving from a particular bearing, which is why it is the first remedy for local electrical noise. The other three are generated inside the receiver and no antenna can influence them. Separating external from internal noise decides whether the remedy lies in siting and antennas or in devices and circuit design, and it is the first question to ask about any noise complaint. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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