I'm not an expert, but I believe that the antifreeze will help protect again oxidative corrosion. The anodes help protect against galvanic corrosion. Two different processes. Since the antifreeze would, I assume, be about the same as fresh water as far as an electrolyte I don't think it would make much of a difference.
Another question, and I don't know the answer as I am an idiot, but if you are putting the boat on the hard for the winter, do you need to worry at all about galvanic corrosion? The boat won't be immersed in an electrolyte...? Now, having said that I know that the Statue of Liberty had really bad galvanic corrosion and she wasn't swimming.
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