I thought 5G in that 600mhz band has much better coverage. Isn't it only ultra wideband that's that low?
but...
you will get less capacity, because at the lower frequencies there is less spectrum (it is simple arithmetic there is 1000Mhz of spectrum below 1Ghz, but there is 100Ghz of spectrum below 100Ghz (setting aside the details about how it gets allocated etc.)
The amount of capacity you can achieve is based on Shannon limit https://en.wikipedia.org/wiki/Shannon%E2%80%93Hartley_theore...
it's the classic engineering trade off, better propagation vs. more capacity.
that is why the carriers want low, medium and high band in their inventory,
low is considered < 1Ghz, medium is considered 1Ghz - 10Ghz, high is > 10Ghz, roughly speaking
https://venturebeat.com/2019/12/10/the-definitive-guide-to-5...
> One low band (600-700MHz) tower can cover hundreds of square miles with 5G service that ranges in speed from 30 to 250 megabits per second (Mbps).
Though... I'm still going to be skeptical with the "there are still some significant areas that lack 4g coverage"
https://fcc.maps.arcgis.com/apps/webappviewer/index.html?id=...
Look at the "how many areas only have one provider" or that you can see the topography and valleys in the coverage map.