I was talking a bit to the Seattle meshing group the other day, and they have some interesting info on their wiki:

  https://wiki.projectmeshnet.org/Software_Projects

  https://wiki.projectmeshnet.org/Projects

  https://wiki.projectmeshnet.org/Hardware

I'm not sure I believe the claims of 15 km or 3-10 km. Maybe in a theoretical ideal situation, but definitely not in an urban setting.

In any case, we should see how far two Ubiquiti Nanostations can link in an urban setting.

Here are the Seattle meshers with a "hardware on a pole" setup:

  http://imgur.com/a/HAAZS

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Marc