Can someone tell me what radar does?  I build one and I don't see any difference.  I would have thought that for a given radius that I would always be able to see.  One thing that I don't like, is that you can tell that the enemy is knocking on your door because you can't see them.  So you can gave a bunch of T1 come up and smash you and your T2 can't fire because they don't see them yet.  Hopefully this is addressed or addressed with building a radar.  But right now, I can't see why anyone build a radar station when it does not seem to do anything.  What am I missing?