> After six years of faithful (and effective!) service my Tennadyne T-10
> log periodic has recently been showing a different SWR pattern:
>
You did not mention if you have a choke balun at the feed point.
Before you go to a lot of trouble, why not install a good balun, and
a short piece of coax and sweep the thing again with your meter.
This will eliminate all possible faults but the antenna itself.
GL!
Phil, K5PC
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