FTTH is a bit difficult to justify in untreed areas where you can do a few hundred Mbps on LOS wireless. But in treed areas that would be limited to <50mbps on wireless, fiber is the best option.
To feed towers with the new wireless platforms that can add up to 1Gbps+ per tower, it's only possible to go through 1-2 wireless hops before the bandwidth needs get to a few Gbps, past the limits of most long-distance wireless platforms and available spectrum, and that will require a fiber backbone to those core towers in the upcoming years.
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