[ns] Directional Antenna (smart antenna)

[Green Tea]

Hi,

Is there any Directional Antenna (or smart antenna) implementation publicly available?
I read several papers saying that they have implemented their ideas in NS2 but all I could find is a few outdated and broken links.
I am trying to implement my ideas on directional antenna (for Mesh or MANET type network). 

Any information would be highly appreciated.

- Greene