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Well, that explains at least some of the trouble I've been having with the antenna I've been trying to modify recently. Take a look at the attached picture. It shows the (somewhat dissected) bits I took off the far end of the antenna feeder. I've edited in a better-focused view of the N-type socket so that you can see where that little bit of metal came from. You'll also notice slight evidence of corrosion on the pin that's still attached to the coax.The compression fitting was probably a poor choice. They're supposed to be water-tight, but things went wrong with this one. The first problem was probably that the connector was on the sharp end of quite a bit of twisting as the rotator turned the antenna to which the feeder was connected. At some point the connector began to slip in response to the twisting. The compression grip wasn't up to the job of resisting that twist, so it ended up getting just slightly loose. That allowed the cable to twist inside the connector. At some point a bit of moisture got in. The centre pin corroded a little. Then the centre connector in the socket broke, and that left a small bit of metal rolling around inside the connection. Most of the time it probably didn't actually short anything out, but it sure made a mess of the connector's impedance. That did the antenna no favours.I'll need to put a new connector on the end of the feeder, and see whether there's a way I can arrange the cable that will reduce the strength of the twisting forces it receives.