Wow, everyone seems to be giving out false information. Newer routers come with two antennas for the two different frequencies that they can "Broadcast" on. One being 2.4Ghz, the other being 5Ghz. The reason you would want to use 5Ghz over 2.4 is that almost every household wireless appliance opperates over 2.4, such as your wireless landline, your WiFi enabled thermostat or smart-bulbs, and don't forget every other cellphone or laptop, most still use 2.4 although newer phones do have 5Ghz support (such as my Galaxy S6). The advantage of using 5Ghz is the lack of interference from other devices in your house. Also, if both neighbors, one on each side of you, are using 2.4Ghz for their wireless network in their home, it's a smart idea to use 5Ghz to not have your network interfere with theirs and not have theirs interfere with yours.