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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.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%.