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One way to check if it's you or something in the neighborhood is to use a battery portable, and turn off the main breaker for a minute. If the noise stops it's probably you, it it persists it's probably neighbors. If it's you turn main back on and individually cycle the other breakers till the noise stops then figure out what the breaker that kills it powers and unplug that stuff one by one till you figure out the source.
Just basic troubleshooting.
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