Hi Levent,
The Whisper Antenna is not made by Cisco but rather Centurion. Here are some spec sheets for the Whisper:
WHISPER™ Unidirectional Antenna
http://www.centurion.com/home/antennaProd/whisper.asp
http://www.centurion.com/home/pdf/id2450.pdf
http://www.centurion.com/home/pdf/ibw_accessPoint_xref.pdf
This antenna is similar to the Cisco 3549 and is compatible with Cisco 1200 series AP's. Here are some specs for the 3549 for comparison:
AIR-ANT3549
Patch Wall-mount indoor antenna with a RP-TNC connector-Designed for use with any radio that features a RP-TNC connector. For use in the 2400-2500 MHz frequency band. The pigtail cable is 36" long. (8.5dBi)
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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