I attach RCA connectors as needed to RG-58U coax. Works like a charm, and izz cheep. I can make the cables in lengths no longer than needed to connect the equipment together, with some cable pairs being just a bit over a foot long. Result is lower capacitance due to cable shortness and a clean, uncluttered look behind the equipment. Cables are all about R, L, and C, nothing more. There's no magic based upon materials used or construction technique used. It's easy to get it right.