It was new two years ago. We looked everything over and all looks good. As far as I'm reaching seems like the cable is all I have for an antenna. Friend put an identical one in at the same time and his works great. Not sure mine was ever great but it got farther than that.
You're talking about a grounding washer aren't you ??
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Tell us what coax you have. The 59 looks like the 58, but the impedance is way different = energy reflected back into the radio.
I've got a ky97A. Never dreamt they'd interchange.Have you swapped another radio into that tray? A200 or a KY97A should fit.
Web
Great read. But I may have violated all the warning items already. I'll put the swr on the list.https://www.cumulus-soaring.com/xcom/XCOM Aerial Dummies Guide.pdf Perhaps a quick SWR check would help isolate the problem to radio or antenna?