> The rural Orcas Island has a lot of hills and obstacles that could disrupt the wireless signals, and it would have been "prohibitively expensive" for DBIUA to install its own towers. As such, many of the radios had to be installed in trees.

Presumably there will be movement of antennae as trees grow. One could monitor the alignment by periodically checking the signal strength between links. I wonder how often things will need to be realigned because the "tower" on which the radios sit changes with time.