Using ESP8266 for arduino

Does anyone have any experience using the ESP8266 to control an arduino over wifi? Does the antenna on the board need line of sight to the router or will it respond to signals as long as its anywhere in range of the wifi network you are controlling it from? Trying to build a robot to be controlled over a local wifi network for a school project.

Don't need line of sight.

This ESP8266 beginner's guide.

It's a normal WiFi connection. It will work anywhere your phone or laptop also has a good WiFi signal.