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If you mean just the choke i can measure the former on one of mine that's stripped down,

won't be today i just came back from the other place where it is & not sure when i will be going again,


The snapped Gain-Master i had here i gave the bottom section & cable parts to a local who had a burned out one in need of fixing,


The coax is bieffe cavi foam dielectric, its about the same as rg58 but better specs higher VF around 81% if i remember correctly,

Their website seems to be down at the moment so can't post a link to the specs,


from the so239 you have a couple of inch then through the former wraps around then back through former & through a hole in the bottom tube then up the antenna,


theres nothing special going on in the choke area other than its dimensionss.