Worth watching...
https://www.rfidjournal.com/news/hundreds-weigh-in-on-fcc-nextnav-petition-for-900-mhz-band-change/221647/
This is a blatant spectrum grab down in the 900MHz band...
https://www.uschamber.com/technology/nextnav-petition-coalition-reply-comments
Which goes back to this...
VHT (802.11ac) in 2.4GHz is the basis for many vendor claims of AC1900 and higher performance.
It's been discussed in other threads that VHT/TurboQAM type connections are a challenge in the real world - I agree, I've been able to do this on a lab bench, but it's rare to see in real-world usage...