I had old WR740 on ground floor and the WiFi signal is not so strong when I am on 3rd floor, so I change its 5dBi omni antenna with 16dBi and direct the signal up.

And I can aslo put it on my 3rd floor repeating my ground floor signal

https://scontent-hkg3-1.xx.fbcdn.net/v/t1.0-9/13151756_1212339888790843_338652116492474305_n.png?oh=f2716739c1e6e8a994a9b4585ff1d60f&oe=579B995C
https://www.youtube.com/watch?v=ibxYjoiJgqg