Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?

Answer: A. Block the amateur signal with a filter at the antenna input of the affected receiver

When a neighbor's receiver is overloaded by your signal, a filter at the affected receiver's antenna input can block your signal from getting in. A filter on the transmitter only helps with unwanted signals like harmonics; it cannot remove your main signal without stopping your transmission.

Tip: Filter the victim's receiver to block your strong signal.