I suppose this also doesn't require roof access in many cases. If someone is willing (and your building super isn't going to get angry at you), you could put an

I suppose this also doesn't require roof access in many cases. If someone is willing (and your building super isn't going to get angry at you), you could put an antenna on a balcony the same way people would put up a satellite dish, and we get could get line-of-sight going at least in one direction from a given building.