[Myrddin]

Light doesn't travel the same speed through coax as it does through free space. There is a characteristic called "velocity factor". Light travels at about 2/3 the speed through coax compared to free space in RG8/U coax. I don't think the parties writing the article finished their basic electricity/electronics courses.

[XNavyNuc]

Kinda hard to transmit light through RG anything... The whole point of the article is to show that 'something' can be propagated faster than 300 M m/sec. In this case a wavefront might be able to carry 'intelligence'. Think of a tsunami, where the 'wavefront' travels at, say, 600 mph across the ocean... and then it reaches a shorefront where the energy contained in the fast wavefront is converted into simple mechanical energy (height of water and forward speed). Got that? Probably not. Oh, well.