Your log indicates that you are not hearing the CCh well enough to do anything. In the shortened report you submitted, the best decode rate available was 9% that means during that period you missed 91% of the signals. Since most OSW's are multi-word affairs, your scanner is not seeing enough to decode the trunking commands.
Now that is the problem, the question is why? Your location says you are in Watertown, so there may be something interfering with the signal on 158.0100, do you have a portable scanner capable of decoding the state system? If so, wander around with it and see, failing that, start shutting down all possible interfering items in the vicinity of your 796, things like computers, DSL modems, other electronics to see if you can isolate the problem.
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