For most people, the router is the first port of call for a lackluster Wi-Fi signal. You might have a router supplied by your service provider, which are quite a mixed bag. Some providers want you actually to enjoy internet access throughout your home. Other service providers seem to take pride in delivering the worst router possible, complete with useless antennas. If you fall in the latter camp, you can make an easy router modification to boost your signal: a high-gain Wi-Fi antenna.