Tooo many things that it'll interrupt.

Those Big long wires are Perfect Transmission Antenna.

The biggest problems are Fire, Police, Military, Air Traffic.

The biggest evil of all is the I²R losses. The impedance how ever small in the powerline, is still very large when you consider 20-100 miles of it. High-Frequency is very lossy, over small impedences over any length of wire that is parallel to the other conductor (now twisted is much better, but that leads to "power line" issues in reliability). There will be an attempt to put a "amplifier" at every few towers, but that will just exacerbate the interference.

IMNSHO, The POTS infrastructure (some being 50+ years old) is more than capable of attaining broadband capacity. There are (currently more expensive than DSL) technologies the can support 100Mbit over POTS for 10KM regardless of quality and is very reliable, as long as there is continuity. Many "circuit extenders" use thing technology.

Something else that could be VERY useful, believe it or not, ARCNET, there is a 1GB spec out the for it, to distances exceeding 100KM, with sub 10ms latency. The problem is, there is *STILL* only physical 255 nodes that can be on any given physical circuit. Looks to me like a /24 CIDR BLOCK works out near perfect. But I suggest you do not hold your breath. The one thing about ARCNET, you could use barbed wire and earth ground for the circuit iffn you *HAD* to, short term only, no really only short term as there are other factors doing that.

The 1Mbit version of ARCNET works out to 18,000ft RIGHT NOW. With a bit of armtwisting, that spec even runs on twisted (or non-twisted) pairs rather nicely.

And as to why they really are not using it, Tell me, who is/was the primary vendor/inventor of it?

That is only a guess, but NIH* is a thing faced all over the world (including my little part of the world)






NIH* == Not Invented Here.