If you can find one... Elixir cables. Little to no capacitance loss over any length of cable. Proprietary cable that is patented. No metal core. W.L. Gore company pulled out of this market (they should have priced competetively).
Short story is that their biggest revenue from this type of cable is from top-secret application in submarines and other mil-spec applications. The signal on the line is not detectible so one is given to understand.
Elixir still makes coated strings, again the best and patented.
The line loss data on these cables is astonishing. You could use a 30 ft. cable and it would be like having only 2 feet of conventional cable for the line loss.
Thanks for the info., JSM
If you should ever find a resources for these cables, I’d appreciate the heads-up.
Best Regards,
TJI