Heard abaout a University which used this to connect the Network in two Tours in the eighties. Place had a lot of fog and birds- so there where problems, but connection was fast.

Highrises would be generally better for this approach- or some long atenna/tethered drone. At this stage though, wouldnt it be rather cheaper, to build a little softrobot and have it drag fibre along preexisting cable channels/stormdrains/sewers - basically just doing the infrastructure decent for cheap yourself.