The smooth nylon antennas have the little tooth marks because the wheel that they are wound on has little serrations, per se, to grip the nylon to facilitate movement of the antenna.
Junk yard is a good place to get antenna parts, I got a whole unit for 5 bucks, and I was able to make one good one out of two for the 240D, now it works perfectly, just as it did from day 1.
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Nick
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2002 Sprinter 2500 140" High Roof :
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