as any radio signal can be affected by any powerful electromagnetic motor. Ever seen a TV lose reception because the guy next door was using a powerful electric drill or the like? Or lose the car radio signal near major power lines? Yet that sort of short range interference is NOT seen as signal jamming.

I know in a military sense a signal is usually not seen as jammed unless it can not be received beyond the jamming device at all. Thus I wonder how a small localised effect would be seen under the law.