Or have a near-identical room to train on, and relatively thin walls in between, say, apartment units, to allow the signal through. This won't account for diffe

Or have a near-identical room to train on, and relatively thin walls in between, say, apartment units, to allow the signal through. This won't account for differences in furniture, but I'd imagine, over time, one could filter out and work around static objects. America's cheap-as-hell apartments could cause even more problems beyond giving apartments a bad rap!