One of the tools that I use to hunt for interference is a battery operated portable radio that tunes the AM broadcast band. If the interference is strong enough to affect TV reception, it will often be heard on AM. An FM portable doesn't work as well. Tune to a clear frequency at the low 540 end and listen; then try the 1600 high end. The built-in antenna acts like a direction finder. An AM radio in the car or a portable radio that tunes the Aircraft Band, which is also AM, can also be used.
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