I just moved to a new place and for using internet I need to connect to a wireless router which is on a different floor. I was getting very weak signal and I was unable to use internet the way I wanted to use. The page loading was very low and I was not not at all happy to work with this connection. I was searching for something that could boost the signals and after googling I found that using external wifi antenna will be helpful.
I went to a shop and got an external wifi antenna which can be connected to a usb port of my laptop. You need to install the drivers for this to work and it really works.
Other factors that may effect the reception of signals are like if you have mirrors that will effect the wifi signals

I found some interesting information to boost wifi signals