The first thing I would do is to aim the antenna at 152 degrees using a compass. If that does not help, then slowly move the antenna a little each way as a test, and then maybe up and down the pole a few inches. Sometimes you can find a sweet spot.
"Adjacent Channel Warning" means there is a channel right next to that one. In your case you have NBC on 16 and ABC on 17. Others can comment with more details.
A pre-amp might help, but first I'd adjust the aim of the antenna and exhaust that possibility (especially since it doesn't cost anything).
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