What are some advantages to taking antioxidants?

Binding free radical. Free radicals are thought to be like chemical monsters and combine with other chemicals that can attack the body and cause cancer and heart disease. The thinking is to get rid of the free radicals to reduce disease before it happens.
Anti aging/antichole. In theory cells will live longer (retard aging) and prevent atherosclerosis ( prevent heart attacks and strokes & associated illnesses).
Remove oxidative str. Oxidative stress is the reason for developing high blood pressure, damage to various organs - antioxidants works by recycling these oxidative damage - almost like we sort the garbage so after recycling items amount of garbage is less and easier to dispose for the body.