That case isn't what's under dispute, and is unlikely to exist, since most buildings make pretty poor Faraday cages. So it's not really that relevant. Further

That case isn't what's under dispute, and is unlikely to exist, since most buildings make pretty poor Faraday cages. So it's not really that relevant. Furthermore, even if the building was a perfect Faraday cage, there are other issues, such as the laws governing public accommodations, and the special scrutiny imposed on "contracts of adhesion" (take-it-or-leave-it standard form contracts) when analyzing them for unconscionability, plus the FCC's mandate which doesn't stop at property boundaries and generally can't be overridden by private contracts anyway. It's not clear that it would be allowable even if you set aside the near-certainty of interference outside the property of the interferor.