I ended up buying three of the porcupine ball attractors. I bought gray electrical conduit for the pipe. I made each side 3.5 feet so the total area is around 7 foot. I made one yesterday on the slip. I am going to place it in the water later today.

I will build the other two units during this next week and place them in the slip. After Christmas I am going to pick up some Christmas trees and place them underneath the sides of the slip.

So I will have pvc in the body of the slip and Christmas trees under the sides of the slip.

If these work out I may buy three more of the porcupine balls as they are so easy to make into attractors.

Thanks to those who commented.

Ed