Controllerless Networks

Hii,

If i want to connect two APs together in a mesh or point to point connection(outdoor), my question is which os version do you recommend me to use it on both APs? and which controller model?

I'm using 274 APs and os version is 6.4.4.4 on both but it didn't work so far

Have you already provisioned and connected antennas?

Did you follow the instructions for mesh?  http://www.arubanetworks.com/techdocs/ArubaOS_6.4.4.x_WebHelp/Web_Help_Index.htm#ArubaFrameStyles/Mesh/Mesh_Access_Points.htm