Which of the following actions should you take if a neighbor tells you that your station's transmissions are interfering with their radio or TV reception?
Why The first step in any RFI complaint is to rule out your own station as the source: check that your transmitter is clean (no spurious emissions or harmonics), that your antenna system and grounding are sound, and then test by tuning your own TV or radio to the same channel while you transmit. If your own receiver is unaffected, the problem is very likely poor immunity in the neighbor's equipment, which is cured with filters, ferrite chokes, or better shielding on their end. FCC rules require you to avoid causing harmful interference with spurious emissions, so verifying your own gear is both good practice and your responsibility under Part 97.
Watch out Installing a "harmonic doubler" would multiply your output frequency and create more spurious energy, not less; it is a made-up cure. Calling the FCC is not a first step, and the FCC expects amateurs and their neighbors to resolve routine interference locally.
Clean your own house first: if your own TV on that channel is fine, the trouble is in the neighbor's set.