The situation: I live in a four-floor house, which means there is quite a bit area for WiFi to cover. The router and modem are located in the bottom floor and as a result, the WiFi signal upstairs is fairly poor (keeps dropping by time to time). My parents' office and my sister's room are located on the top floor and frankly they are quite annoyed by the fact that the WiFi is unreliable. So, (obviously) they asked me to do something about it. There is no Ethernet wired around the house and moving the router isn't really an option (there aren't any better spots for it). However, the WiFi is fine in most of the top floor (e.g. kitchen gets full signal and never drops) so it's really only the office and my sister's room where the WiFi sucks. I guess what I'm asking here is: Is it possible to buy for example another router and wirelessly extend the WiFi coverage? Note that there are no Ethernet ports upstairs and running a wire from the current router to a new one isn't an option either. Basically, can the second router pick up the signal from the main router and extend it? Like I said, the signal is fine in the kitchen so the second router could be placed there. Thanks to everyone in advance. I'll be straight here and just admit that I know pretty close to nothing about networking and hate it in every possible form.