That's actually the inverse of the problem. Yes, 1.7Ghz doesn't penetrate well, but in cities you want density, because you have population density. Low band

That's actually the inverse of the problem. Yes, 1.7Ghz doesn't penetrate well, but in cities you want density, because you have population density. Low band is still useful, but not nearly as advantaged as in rural areas. In rural areas, using 1.7Ghz vs 600Mhz or 700Mhz spectrum means building 4x the amount of towers to cover the same square miles. That's opex, capex *4. It's really expensive, with no benefits at all as you're not capacity constrained at all on radios/spectrum in rural areas.