I love books....
Somewhere in my collection I have a book from the 30s written by a woman who claimed her ancestor invented radio transmission in the late 1860s. Too bad, too -- the world will never know.
Throw out those 18GHz cables, HDMI 2.1 is here
In that book there's a listing of uses of different parts of the radio spectrum. Everything above 35 MHz is declared to be of no use for anything.
The 48 GHz mentioned in the HDMI 2.1 spec is about 1.5 million times that figure!