This is Wireman's Military Spec RG-213/U 50 ohm inpedance coax. The velocity factor is .66; it has a tough polyethylene dielectric with a class 2A jacket. Mil Spec RG-213 is a superior product with a .405" OD; its rated at legal limit power. This product has a 98% shielded braid with the class 2A jacket; it can withstand UV sunlight up to 20 years. It sells for $0.89¢ per foot. This is the "good stuff" and the work horse for all HF applications.
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