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kill all power to the house, then run your radio on batteries. See if there's interference.
Are you near any power lines? Any radio / TV towers? An airport? really tall buildings? In a valley surrounded by mountains? All this stuff can wreck havoc on radio reception. What's the reception on your car's AM radio like? How far do you have to drive before it gets better. If you really wanna nail it down, drive away from your house in several different directions and see where teh signal strengthens. Once you have a border around the trouble area you can isolate where the interference is coming from.
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