This is a Barbed Wire Fence with a basic material.
Basicly you make one object and duplicate it along curve. Check it out here, on blender wiki: http://wiki.blender.org/index.php/Doc:2.6/Manual/Modifiers/Generate/Array
Thank you for great model! I needed it to upcoming game Identity Unknown. It is also shown in the game's header image: Tuima Vision
wow, how to make a spiral?