Just got a new router, be9300, upgraded from older asus. I want to extend the range, what do I need? Don't need anything to be plugged into it, just have a decent sized house and want to put...

I just got a new router, the be9300, upgraded from an older asus. My question is, what do I need to buy for range? An extender or what? I don't need it too far just a bigger house and part of the...