This quick little bash script will do everything covered in the FreeSBIE Wireless section.
#!/usr/local/bin/bash killall dhclient kldload bridge ifconfig wi0 ssid SSID channel 11 media DS/11Mbps 192.168.0.100 192.168.0.255 255.255.255.0 route add -net 192.168.0.0 -interface 192.168.0.1 route add -inet 0.0.0.0 192.168.0.1 echo "nameserver 192.168.0.2" >> /etc/resolv.conf cat /etc/resolv.conf ping -c 4 www.google.com echo Done