FAQ: Why am I not getting PERFECT Wi-Fi coverage?

A mid-range signal level (shown in green on the heatmap when the default minimum and maximum levels are used) is actually considered good. Usually, routers and Wi-Fi transmitters are configured for a medium-strength signal, not an overly strong one. Reasons for this include security (to limit the area where people can potentially connect to your network) and noise prevention (so that you are not creating a lot of interference for your neighbors).

You may also want to try removing any sleeve or case from your MacBook, to see if that makes a difference (some may interfere with your Airport adaptor’s antenna).