Go CCIE Go!! - A Cisco Certified Internetwork Expert

Hi Guys,
We setup a point to point bridge between two trailers. They are about 300 m away. The throughput we test via FTP is just about 6-8Mbps. I opened a tkt with Cisco, but not too much help so far. Could somebody please give some suggestion. Below is the configuration.
We tried to adjust antenna, but the Signal of Strength is still not good.
Site-B#sh dot11 associations all Address : 001f.6ca8.a1b0 Name : Site-A IP Address : 10.9.97.13 Interface : Dot11Radio 0 Device : 11g-bridge Software Version : 12.4 CCX Version : 5 Client MFP : On State : Assoc Parent : Our Parent SSID : TEST VLAN : 0 Hops to Infra : 0 Association Id : 2 Tunnel Address : 0.0.0.0 Key Mgmt type : WPAv2 PS Encryption : AES-CCMP Current Rate : 2.0 Capability : WMM ShortHdr ShortSlot Supported Rates : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 Voice Rates : disabled Signal Strength : -78 dBm Connected for : 993 seconds Signal to Noise : 21 dBm Activity Timeout : 15 seconds Power-save : Off Last Activity : 0 seconds ago Apsd DE AC(s) : NONE Packets Input : 16560 Packets Output : 7175 Bytes Input : 2913582 Bytes Output : 1965316 Duplicates Rcvd : 0 Data Retries : 3321 Decrypt Failed : 0 RTS Retries : 864 MIC Failed : 0 MIC Missing : 0 Packets Redirected: 0 Redirect Filtered: 0
-========Root Bridge=============
hostname Site-A ! enable secret 5 $1$1Wqo$xUtSEDMsu/5qNu.JK.If.0 ! no aaa new-model clock timezone -0500 -5 clock summer-time -0400 recurring ! ! ! dot11 ssid TEST authentication open authentication key-management wpa wpa-psk ascii 7 06056433404B0D485744 ! dot11 ssid TEST ! ! ! username Cisco password 7 045802150C2E ! bridge irb ! ! interface Dot11Radio0 no ip address no ip route-cache ! encryption mode ciphers aes-ccm ! ssid TEST ! speed basic-1.0 basic-2.0 basic-5.5 basic-11.0 basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 channel 2462 station-role root bridge cca 75 distance 1 bridge-group 1 bridge-group 1 spanning-disabled ! interface FastEthernet0 no ip address no ip route-cache bridge-group 1 bridge-group 1 spanning-disabled ! interface BVI1 ip address 10.9.97.13 255.255.255.0 no ip route-cache ! ip default-gateway 10.9.97.2 ip http server no ip http secure-server ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag bridge 1 route ip ! ! ! line con 0 line vty 0 4 login local ! end
=======Non-Root============= hostname Site-B ! enable secret 5 $1$EaAo$AWWWzV/xqVj1ZJfjLl/Za0 ! no aaa new-model clock timezone -0500 -5 clock summer-time -0400 recurring ! ! ! dot11 ssid TEST authentication open authentication key-management wpa infrastructure-ssid optional wpa-psk ascii 7 0534391D2D494A584B56 ! ! ! username Cisco password 7 01100F175804 ! bridge irb ! ! interface Dot11Radio0 no ip address no ip route-cache ! encryption mode ciphers aes-ccm ! ssid TEST ! speed basic-1.0 basic-2.0 basic-5.5 basic-11.0 basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 station-role non-root bridge cca 75 bridge-group 1 bridge-group 1 spanning-disabled ! interface FastEthernet0 no ip address no ip route-cache bridge-group 1 bridge-group 1 spanning-disabled ! interface BVI1 ip address 10.9.97.10 255.255.255.0 no ip route-cache ! ip default-gateway 10.9.97.2 ip http server no ip http secure-server ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag bridge 1 route ip ! ! ! line con 0 line vty 0 4 login local ! end
Thanks in advance!
Joshua