Ask HN: What's with the DIY state of the art long-range Wi-Fi?
Freifunk should work fairly easily; take 2-3 2X2 MIMO routers (like 20 bucks each), adjust the firmware for them, get the P2P directional link to either use existing satellite dishes (not sure what the easy orthomode splitter is, here, as you need same-source-spot signals for both horizontal&#x2F;vertical or left&#x2F;right polarization), or simple DIY&#x27;d axial helix antennas (made on plastic&#x2F;cardboard tube of appropriate diameter, by winding an even spiral at the right &quot;thread pitch&quot;, then fixing it in place with glue&#x2F;tape, and weatherproofing the assembly) (one wound like a normal screw thread, the other like a reverse thread, and put side-by-side with a gap of like 5-10 tube diameters to not interfere with each other).<p>Use the router&#x27;s switch ports to connect them with each other, and use one local router with stock antennas pointing straight up to serve local clients and mesh with possible nearby mesh nodes.<p>The electronic warfare resilience is going to involve hacking the collision avoidance techniques to be sufficiently less aggressive, and likely to get Freifunk to use encryption for the mesh links. If necessary, just set up P2P links with per-link encryption. Routing-table-affecting nodes in a mesh sadly need some inherent trust to be performant in the non-adversarial case, or at least, no one seems to have tackled that possible issue yet (to the point where you could just compile existing software for the router at hand and get something working by the end of next week).