Question about Dunking!! (Help)?

I have a basketball pole outside my house, and im wanting to jump higher. The Basketball pole is adjustable so I can set the height of it. So I placed the Basketball pole down about 2 feet so I can dunk, and I can barely dunk it on it. But, I think if I keep dunking on it, I will jump higher and it will become easier. Then once its easier, I'll move it up another foot. Would this help my jumping?