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LMR400 has a copperclad aluminum center conductor. LMR400 is often considered a modern replacement for older Belden 9913. LMR400 is lighter in weight and easier to manufacture. It is also more flexible making it somewhat easier to work with. However, at most frequencies the Belden 9913 has a tiny advantage in slightly less loss compared to LMR400. The LMR400 dielectric is basically foam which makes it more rugged than Belden 9913.Also called Times Microwave, LMR400 has a copperclad aluminum center conductor. LMR400 is often considered a modern replacement for older Belden 9913. LMR400 is lighter in weight and easier to manufacture. It is also more flexible making it somewhat easier to work with. However, at most frequencies the Belden 9913 has a tiny advantage in slightly less loss compared to LMR400. The LMR400 dielectric is basically foam which makes it more rugged than Belden 9913. Basic LMR400 has a solid center conductor. The more expensive Ultra Flex LMR400 has a stranded center conductor. Comparing LMR400 to the inferior RG213 you will probably not notice a difference in loss on the HF bands for lengths less than 100 ft. For runs at 200 ft then you will start to notice where LMR400 outperforms RG213. At frequencies at and above the 2m ham band the difference becomes far more noticeable.