What does these notes structures do?

[Fullmetal]

I built some of them, like the antenna, but it doesn't seem to do anything. There is another one that looks like a mill. Is there somewhere I can see what they do?

[Szeveranz]

They're traps, try luring an enemy near them. There will be videos on youtube if thats what you're after though, I think the ones you mentioned are the spin trap and grind trap

[Fullmetal]

Originally posted by Szeveranz:

They're traps, try luring an enemy near them. There will be videos on youtube if thats what you're after though, I think the ones you mentioned are the spin trap and grind trap

Oh. Thanks