Once you get into directional antennas the network isn't so "meshy". 5.8 suffers a lot from foliage and 2.4 does enough to hinder distance. The 900 MHz band has more promise. Better bet would be to have dual radios 900 MHz and 2.4 GHz. Use 900 MHz to mesh and 2.4 for uplink. You would want an outdoor unit that can be mounted on a tower. Similar to what we do in commercial space.