50ohm 7/8" RF aluminum cable, the same characteristics as RF coaxial copper cable. low attenuation, ... 9 Outer conductorAluminum-tape,longitudinal welded ,ring corrugated25.4 JacketPE or fire-retardant PE27.8 ... Electrical Characteristics ItemSpecificationremark Characteristic impedance(Ω)50±1 Velocity91% Insulation resistance(MΩ•km)4000MΩ.km VSWR800~1000MHz, ≤1.10 1700~2500MHz, ≤1.13 2500~3000MHz, ≤1 ...