Ok I downloaded that App and set my channel so that they dont overlap.
@Packer
I got 4/5 bars on channel 8, 5/5 on 11. Theres a computer in pretty much every room and they all get about 4 or 5 bars. My router and modem are different I think, the cable cord plugs into this big black box and then that has a cord that runs to the router. Idk if thats the modem or not though.