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We also have to consider that cables with thinner conductors have more inductance too. That added inductance between the amplifier and exciter and the amplifier to antenna, can cause problems. That's one reason why some amplifiers without tuned input circuits often perform better when driven through the shortest cable possible. I know in the case of tube amps without an input circuit, the RF return path from the amplifiers input has to go all the way back to the exciters output stage. The other reason is the mismatch between the input and 50 ohm cable becomes worse as the cable is longer.