[efnfast]

I talked to Ron Davis about this with their radiators, and ended up not using one

For it to be effective, you'd have to be checking it all the time : when serious electrolysis happens, your anode will be gone fairly quickly, then your radiator.

If you check it, it's being affected, replace it and repeat, you're just on borrowed time and need to address the grounding problem.

Also, most anodes (such as the flex-a-lite) use a brass fitting, not an aluminum one....brass fitting in the aluminum rad is a big no-no