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The coupling of electromagnetic fields through CATV drop cables can be measured using the radiometer described in this paper. The theoretical analysis of this coupling, which began in 1934, is reviewed and the measurements agree with the predictions. Accordingly engineers can theoretically analyze and design coaxial cables. The measurements show that the different types of drop cables in use result in a large variation in coupling. The flexure measurements show that some cables would be expected to have 10 times longer flexure life than other types.