I have used the regular Belden 9913 (air core etc) taped along with four
other RG-8 coax cables around the rotor (that is, via a loop to accomodate
the truning rotor) for over eight years without failure. Same coax also
goes down the crank up tower flexible run, again taped frequently with the
four other cables (and there, also with a run of rotor cable). No
failures of it despite frequent up and down of crank up tower. K4VUD
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