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The characteristics of a triaxial test fixture, which has been developed for screening attenuation measurements on long shielded cables, are described. Screening attenuation performance of a selection of coaxial CATV cable braid and multi-foil/braid shield designs are presented. Measured screening attenuation results for 30 meter long cables covering the frequency range 1-100 MHz are compared with results from measurements on 1.5 meter long cables that were measured over the frequency range of 1-1000 MHz. The comparison shows that the estimation or deduction of long length, low frequency performance from high frequency performance can have significant error. The paper concludes that worse case or minimum screening attenuation performance ...