Hi Tanveer,
It is possible to use the 24120 Antenna with the 1200 series AP's. Have a look at the attached docs;
AIR-ANT24120
This antenna operates in the 2400-2500 MHz band and is designed for use outdoors. The antenna is compatible with Cisco Aironet radio products utilizing a reverse-polarity threaded naval connector (RP-TNC) connector.
This antenna is designed for use with Cisco Aironet access points and bridges but can be used with any 2.4-GHz Cisco Aironet radio device that uses a reverse-polarity threaded naval connector (RP-TNC).
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps469/prod_installation_guide09186a0080148acf.html
Omnidirectional Mast mount outdoor high gain antenna with a RP-TNC connector-This antenna was designed for WLAN applications for frequencies of 2400-2500 MHz. The antenna is omni directional and has a nominal gain of 12 dBi. This design uses an elevated center-feed to produce an elevation pattern with very little "squint" or beam-tilt. It is designed to be mounted on a round mast.
Cisco Aironet 1200 Series
Cisco Aironet Antenna Reference Guide
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_data_sheet09186a008008883b.html
Hope this helps!
Rob
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