re: Hanging Christmas lights help

I have nails around my house. They are about 4 inches long, maybe, and come out about 2 inches. They are angled slightly up and can't be seen from the house. It takes less than 10 minutes to hang lights around the front of the house and when it is time to take down I pull the first couple sections off(about 4 feet apart) and then from the ground give a nice wavy tug and they all come off about 3-4 sections at a time.

The nails have no head on them.