Wi-Fi extenders and mesh Wi-Fi systems are two different ways to extend the reach of your router. If you need your Wi-Fi network to reach only one more room, a Wi-Fi extender can do the trick, but mesh Wi-Fi systems are great for homes over 3,000 square feet. And if you want a wired connection but don’t want to snake an Ethernet cable through your walls, you should check out powerline Ethernet adapters.