A TV Fool report would help us be sure of the signal conditions you're working with.
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... all of these worked fine a year ago and the signal strength problems have steadily worsened to the point that I've permanently lost the picture on the KATU channels.
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Top item on my list of suspects is water intrusion into the coax or balun. Right along with that is corrosion. If this is a "Stacker" antenna, look for degradation of the coupling/phasing harness.
A fairly inexpensive 'test tool' is a factory built, known good length of coax and balun. In your case, I'd be interested to know what sort of signal would you see if you disconnected the existing balun at the antenna, and then connected the 'test' balun and coax to only one tuner. If you see a reliable signal, what happens if you feed the input of the 3-way splitter with the 'test' coax and reconnect all the tuners?