> Joe (OP), have you tried holding that metal shielding plate at various
> distances from the microwave but along the  line of sight? It would be
> interesting to see if it still prevents the interference when you are
> holding it near the microwave oven instead of near the set-top box

Surrounding the microwave oven with several cooking trays (~1mm
thick, 12" x 16") is much less effective than one tray in front of the set-
top box

AIUI, the microwave oven enclosure is supposed to be a Faraday
cage at microwave frequencies, for the obvious reason. So what is
being radiated could be longer wavelength RF ?

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