1) Unplug your hardware and do a scan of wifi networks nearby and note the channel numbers and strengths of each network. Make sure you choose a channel that's

1) Unplug your hardware and do a scan of wifi networks nearby and note the channel numbers and strengths of each network. Make sure you choose a channel that's neither the same nor close to what's used by the stronger networks you can see. 2) Consider turning off 5 GHz completely. 2.4 GHz has better penetration through walls and other obstacles, and the speed difference between 2.4 GHz and 5 GHz when you're closer to the access point is often irrelevant compared with the speed of your Internet connection. 3) If you buy additional equipment, do not buy a "repeater". They're usually crap and usually make things worse overall. Buy a device that can be a bridge - that is, that can act as an access point and not just as a "router" - and connect it to your primary device via ethernet, and situate that device closer to where you're having issues.