Here is a passage from the link following:
Mounting Hardware
Each antenna requires some type of mounting. The standard dipole antenna simply connects to the RTNC connector on the back of the unit. The 5.2 dBi mast mount omni and the yagi antennas are designed to mount to a mast up to 1.5 inches, and each comes with mounting hardware for attachment. The 13.5 dBi yagi has an articulating mount option listed in the back of this document. For most indoor applications, a .75" or 1" electrical conduit provides a suitable mounting. For outdoor application, a heavy galvanized or aluminum wall mast should be used that will withstand the wind loading rating of the selected antenna. Patch antennas are designed to mount flat against a wall or ceiling. Ceiling mount antennas are equipped with a drop ceiling cross member attachment. The 21 dBi Parabolic Dish mounts to a 1.625" to a 2.375" mast. Fine threaded turnbuckles allow accurate aiming of the antenna.
http://www.cisco.com/warp/public/cc/pd/witc/ao350ap/prodlit/agder_rg.htm
For the AIR-ANT2506 you need a mast of up to 1.5 inches in diameter and the AIR-ANT1949 will fit a mast of up to 1.25 inches alone. With the AIR-ACC2662 it looks like it will fit the same size mast as the 1949 antenna.