My current 27km AirFiber 5XHD link on 3' (1m) 34dBi antennas and 100MHz of spectrum ...
This setup hardly qualifies as "wifi based link". While it does use frequency from U-NII-3 band, it obviously doesn't use 802.11-compliant channel width (which would be either 80MHz or 160MHz) ... and quite possibly doesn't comply to usual WiFi country regulations (it seems that for US it should be around 30dB EIRP).
I think you guys missed the point of my AF5XHD post.
Normis asked for
MikroTik Wifi-based links that are 30km or longer. The first few posts are people posting much shorter links. I posted about a 32km link I built with MikroTik gear, but it was pretty poor (and it was only in place to test some modifications we had made). Other >30km links posted likewise have unremarkable throughput results.
Subsequently, some posters suggested you can't do anything worthwhile in 5GHz at that range. Well, with 30dBm, you're right. But some regulatory bodies allow for more power in 5.2/5.8, and I posted about real world experience that suggests you can indeed get decent bandwidth out of 5GHz.
In the US, DFS range is limited to 30dBm. The FCC reconsidered rules for U-NII-1 (5150-5250) and U-NII-3 (5725-5850) a decade ago. Max conducted power is 1W out of the radio. While max PTMP in 5.2/5.8 is 4W (36dBm), for U-NII-1, max EIRP for PTP is 200W (53dBm), and for U-NII-3, there is no PTP gain limit (
https://transition.fcc.gov/bureaus/oet/ ... 014-TN.pdf,
https://docs.fcc.gov/public/attachments/FCC-14-30A1.pdf).
My LTU-based AF5XHD's get a similar bits/Hz as 802.11ac gear. To be fair, I went ahead and put the Rocket Prism 5AC into the calculator using the same antennas my LTU radios are using, and it shows a theoretical aggregate throughput of 662Mbps across 80MHz (I'm getting 645 on 100MHz). 802.11ax is supposed to do better, and indeed, on the bench, I get up to 800Mbps over 80MHz with hAP AX3 to my phone or laptop. Other US-based WISPs have reported their Cambium 802.11ax-based deployments are pushing 400-700Mbps across long distances.
So, to bring it (mostly) back on topic, I've ordered two NetBox 5AX's I'll be testing at 27km (close to but not quite 30km) with 3' dishes. What I can do with those should easily translate to 30km with only a small degradation in performance.