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Post your exact location TVFool plot (link, please, not an image) so that we can estimate your signal environment. Also, run your FMFool plot and post an image (has to be an image) of it.
Why do you have two amplifiers installed? One is usually plenty for most situations, two are almost always one to many. Have you tried eliminating the second amp and checking to see if the problem is resolved?
Do you have the FM trap in your preamp in or out (on or off)? You have a close by FM station (94.9) that has a very strong potential to interfere into VHF channel 9 (2nd harmonic).
Loss of a single VHF station that was previously well-received is almost always due to localized electrical interference. See the attached tip sheet that I often send to customers, it can provide some insight.
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