I thought the chirps where actually not spanning more than a channel band worth of frequency?

Also you cannot control the frequencies according to the spec.

You need lower frequencies for range and control over those frequencies to not saturate the ether.

The bandwidth will be low for these radiomesh networks, but if you build a robust enough routing and get enough channels (300 with 5KHz separation) you can scale.

I'm going to use the upper part of the open 169MHz in Europe.