Try moving the problem TV to a location that is served by the shortest cable run. The tuner may be less sensitive than the other TVs or the cable run that serves the problem TV may have a fault of some sort (bad connector(s), crushing, kinking, puncture, moisture intrusion, etc.).
Perform a full rescan of the problem tuner... Disconnect the antenna, then run a full channel scan. Unplug the TV and leave it for 30 min or more. The reconnect the power and antenna, run another full channel scan.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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