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* solid center conductor* stranded center conductor RG8/U and RG8A/U has been obsoleted and RG213/U is the modern replacement. Both RG213/U and RG214/U are considered military specification cable. This is very rugged cable and a popular choice among amateur radio operators. However, the cable begins to be noticeably lossy at higher frequencies. A 50ft run of RG213 for the 2m ham band is perfectly acceptable. A 100ft run of RG213 for the 70cm ham band is ill advised.Comparing RG8X and RG58: They are both the same diameter. RG58 is more flexible. RG8X has slightly less signal loss. In a mobile installation any loss below 1GHz is inconsequential.RG213 is good for use on HF frequencies with cable runs up to 100ft without suffering any appreciable loss. It is not ideal for the VHF band and absolutely a poor choice at 70cm. The loss becomes significant as you increase frequency, it should not be considered for use above 220MHz.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. 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.Both Belden 9913 and LMR400 have a .405 inch outer diameter with a #10AWG center conductor, and takes ordinary Amphenol connectors like 83-1SP (UHF male), as does Belden 9913 and LMR400 have a .405 inch outer diameter with a #10AWG center conductor, and takes ordinary Amphenol connectors like 83-1SP (UHF male). The center conductor of Belden 9913 and LMR400 is slightly larger than RG213. More modern is the Belden 9913F7, which uses 10 AWG stranded (7x19) .108" bare copper conductor and gas-injected foam HDPE dieletric insulation. This makes it more competitive with LMR400. The "F" is the indicator of a "foam" dielectric. If the designation is LMR-400 UF then the U indicates it is UV resistant, which withstands better in direct sunlight. Belden 9913 F7 is a low loss flexible foam dielectric with a VP (velocity Factor) of 85%.