WiFi Range Extender? - Time Warner Internet

This question is about "WiFi Range Extender?", with Time Warner Cable internet and apps. The wireless Linksys router is positioned in the living room of the main house which is located about near the center so the signal is pretty good anywhere you're at.

I have a guest house in the backyard but the electronic devices cannot pick up the wifi signal. I have a laptop back here which is about 50 feet away from the wireless router. Will a wifi range extender help in this situation? I want to get good internet connection and speed as I do in the main house but not sure if a wifi range extender can accomplish this.

WiFi Range Extender??