We are using Cisco 1200 access point in our small retail shops and use some wireless heldheld devices to connect the wireless network. Since the shops are inside the shopping plaza, there are many other wireless access point which interference our wireless clients. The access point were installed in the middle of the shop, sometimes, our client walked to the shop entrance (< 10m from the access point), the wireless network was disconnected and it may try to connect the other unknown access point. I tried to change the frequent but it doen't help. We are using a pair of 2.2dBi Dipole Anntenna wit the AP and mount in on the wall (~ 1m above the ground). Is there any suggestions to improve the coverage? Is there any improvement if I use a more powerful anntenna (e.g. 6.5 dBi Wall Mount anntenna)?