I need information for this Antenna

In school my teacher says to find information for this type of antenna i need thoose informations How its work,how to use and princip of work.

I have just a photo for this antenna
This antenna name meybe is : BUTTERFLY SNAP ON UHF ANTENNA

Photo :

link of photo : http://imageto.net/images/gc32315.jpg

Photo:

Link of photo : http://imageto.net/images/hd8200uzoo.jpg

Please i need it for today.
Give me some information plz.

http://www.hdtvprimer.com/ANTENNAS/types.html
folded dipole and yagi