The passing cars/planes/boats phenomenon is pretty common. If my antenna is mounted near ground level, the signal breaks up every time a cah drives past on my street (seldom here). Certainly the large passing metal object changes the propagation of radio waves (and TV) locally, but the exact nature of the change I'm not sure. I'd guess the big metal object is reflective and it creates multipath interference. Might help to put your antenna higher, like on the peak of your roof.
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