For all other users of ZTE AC 2766 the pigtail to use in India is CRC9 male to TNC female@kuduku I have sent you a pic regarding antenna query.
Ebay link http://www.ebay.com/sch/i.html?_sacat=0&_nkw=crc9 male tnc female&rt=nc&LH_BIN=1
http://translate.google.co.in/trans...pigtail/pigtail-umts-pig-crc9.php&prev=search
Some pics from my dropbox https://www.dropbox.com/sh/6ls7vuoetncfftl/3LgjOljcww
CRC9 was also used in Huawei 1831 modem when BSNL/MTNL 725 UL 3G was on , so most will already be having it .
Patch antenna cable supplied by BSNL has TNC male on both ends .