Why use HF spectrum when there is so much other, more suitable and much
wider, spectrum available way up the bands

Because the extant infrastructure is overly lossy at higher frequencies.

It IS extant infrastructure. Hard to argue that point, my friend.

BPL will be one of many options many folks will have, and in many cases it will
be the only and/or best one. That is why it will be successful in the United
States.

Other options are bound to capture relevant market share as well. It's a big
country and a huge market, easily amenable to several tech paths Everyone
wins! What a deal!

That is why BPL is supported by both Presidential candidates. One of the few
points both these gentlemen agree on.:-)

73,
Chip N1IR