N300 WNR2000v2 Wireless Router slow download speed

Hello,  I purchased a N300 fifi range extender to help cover the whole house with my u-verse internet.  The u-verse wireless router typically gives me 200 mpbs down.  However, my N300 wifi range extender is only providing 8 to 10 mpbs down.   The specs says it should be good up to 140 mpbs down.  The extender is in line of sight of the wireless router and I have green lights across the board on it. 

Any help is appreciated. 

Thanks