If you're on the edge of wi-fi sometimes any improvement will be minor as distance and objects are hard to overcome. You can try an USB based antenna that's relocatable in order to best reception. -OR- build a simple wi-fi can and allow it to help. Google on the topic and it's not that hard, but that USB antenna is required. One being the mesh strainer method. Of course, there are more fancy ready made antenna, but again its what the distance needed to be covered that matters here. Alas, you must be handy, if you make you're own and the strainer method does work and is simple.