OK, but the app will show you overlapping bands, say from a neighbour so you can try to find a vacant band to use, instead of guessing. I know there are windows apps that can do a similar thing, I assume yours does? I just suggested the Android one as that is what I have on my phone, and it seamed better than telling you to search for one.
The other thing with routers is they are very directional from the antenna, so you can be right next to it and have terrible signal. Aiming the antenna can fix this, or re-positioning the router if the antenna is internal. That's why I suggested moving around a bit to test.
http://lifehacker.com/the-best-way-t...rpe-1605924745