Before revision: To get 600 Ω parallel line, the same wires would be spaced ; 600 Ω is roughly the practical limit for transmission lines made with wire rather than thicker copper clad steel cable, or with aluminum or copper pipe.
After revision: To get 600 Ω parallel line, the same wires would be spaced ; 600 Ω is roughly the practical limit for transmission lines made with wire rather than thicker copper-clad steel cable, or with aluminum or copper pipe.