T3A01:Why do VHF signal strengths sometimes vary greatly when the antenna is moved only a few feet?
Direct answer summary (2026-2030 NCVEC pool)
The official correct answer for T3A01 is Multipath propagation cancels or reinforces signals.
The reason is multipath propagation cancels or reinforces signals. Connect the cause in the question to this direct result instead of memorizing the answer letter.