Original link : http://www.zero13wireless.net/foro/showthread.php?t=1150
PDF Specification : http://www.dlink-me.com/ftp/antennas/pdf/ANT24-1201.pdf
Gain should be around 12dbi.
And here it is what is inside : usual yagi directors are madded from aluminum /i think/ and pcb dipole used as feeding element
You are wondering were did You saw similar dipole feeding ??? I tell You : http://www.digdice.com/2007/09/28/sector-antenna-grad2487/The feeding of the dipole is very similar.
Dimensions for this antenna