802.11ax probably won't help you for a point to point link. The only thing that would potentially help is the 1024QAM modulation, but unless you have really nic

802.11ax probably won't help you for a point to point link. The only thing that would potentially help is the 1024QAM modulation, but unless you have really nice antennas, it probably won't work at that distance. The three streams may not be helping much either, since there may not actually be much spatial separation point to point at several hundred meters. Best case, you're only going to get maybe a bit over half the link rate in real bandwidth. There's just a lot of overhead with wifi. If you're using omnidirectional dipole antennas, you're losing a lot of signal strength at that distance by radiating mostly in the wrong direction. Your best bet, I think, would be to use two sets of linearly polarized directional antennas offset by 90 degrees. That way, they're out of phase and you may be able to get 2 independent spatial streams. Alternatively, use two directional antennas but point one set indirectly at a big flat metal wall or something, in the hope that the signal reflects and intentionally gets some "multipath". Also, turn off "legacy" support so that you're using lower overhead greenfield preambles.