I haven't seen any specs on it, but antennas of that size are usually around 2 to 3 dbi gain.

just for info, i mounted two behind the lcd, they both have 5 db gain

i got them on ebay, they are made by a company ethertronics, but they are olny sold oem, so its hard 2 find them

here's the link:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3467591071&category=31534&sspagename=STRK%3AMEBWN%3AIT&rd=1