using ipsec on wireless site to main office

[huntg]

how do i secure a leased wireless tunnel between a cisco 2500 at the remote site and a cisco 7200 at hq. The leased wireless tunnel is provided by an external company that uses clearwire equipment.

[#2]

The procedure given in the follwoing document can be used for securing the leased line tunnel :

http://www.cisco.com/warp/public/707/ipsec_gre.shtml