Shieldsy knows some shit... He just knows NOTHING about wireless. As far as MS servers go he knows alot. As far as network design go's, he does a pretty good job. As far as wifi goes... He fails miserably...
The reason isn't because it's the same channel, it's because the access points are not designed for the traffic they are getting. All Dlink personal ones. Not to mention the coverage is pretty mediocre...
They where going to go Cisco Airnet and that would have been a very good idea... But it looks like they changed their mine. Why are you using wireless anyway?