A transmission line cable that utilizes a plurality of substantially flat insulated conductors, each consisting of two or more solid metallic strands laid side by side in a parallel configuration within an extruded insulator. The plurality of insulated conductors are stacked into groups of two or more and may be utilized as signal conductors or shield conductors. Once the insulated conductors are stacked, the stack is twisted together, and either wrapped in a conductive insulator, placed in an extruded non-conductive insulator, or both, creating a cable that is stable, flexible, and has improved transmission characteristics, including reduced attenuation, noise and signal skew.