T7B05:Which of the following might reduce interference by an amateur station to a non-amateur over-the-air radio receiver?
Direct answer summary (2026-2030 NCVEC pool)
The official correct answer for T7B05 is Block the amateur signal with a filter at the antenna input of the affected receiver.
The key fact is Block the amateur signal with a filter at the antenna input of the affected receiver. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.