looks like you have indeed some powerful radio source around there causing your issues.
Such problems arise even in case of FM radio transmitters in proximity, those interferences can jam everything with something even remotely resembling an antenna.
In Italy there's a famous case with Vatican Radio, powerful transmitters designed to reach big part of our peninsula, so much that are pushing their signal in entry phones in Rome. You can literally hear prayers coming through doorbell speakers of condos along sidewalks.
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