The Tip Board
To avoid the snags and hassel with sinking xmas trees and brush to attract crappies we build our own structure. Take a 4x4 piece of plywood and drill some holes in it (makes sinking easier), screw 1"x2"x4' sticks of lumber vertically on it, use as many as you like. Strap cement block on it and sink in favorite location. The crappie will congregate inside it just like tree stumps or bridge pilings and there's nothing to get hung up on.