D-Link AirPlus Xtreme G DWL-2100AP (DHDWL2100AP) 802.11b/g Wireless Access Point "keeps roaming" Questions

can i keep three D link access points on 6 channel my other IT friend keep the three D link dwl-2100 APs on channel 6. he tell me that it work fine in this channel. because here the building is Kspan ...