Mac road warriors unite and rejoice. Finding a nearby wireless network has never been easier, and Wi-Fi network troubleshooting to improve the wireless signal on your Mac is almost kindergarten.
We're excited about the number of Wi-Fi apps available to help us, and one of the best and highest rated is WiFi Explorer. Wireless tools like WiFi Explorer have a long list of features, but that's the basics you're looking for. A strong Wi-Fi signal.
In this case, WiFi Explorer supports both 2.4 GHz and 5 GHz frequency bands (if your Mac does) and 20, 40, 80 and 1
Your entire nearby wireless network coverage is listed and signed by signal strength.
It's not just about listed network-connected devices. WiFi Explorer also describes signal strength, channels and channel conflicts and signal to noise ratio. If WiFi does not work as fast as you expect, it's easy to find conflicting devices on the same or nearby channels, which also makes the graphical analysis of your network worthwhile.
WiFi Explorer makes it easy to convert from dBm (the common measurement system for signals) to percentages. Columns can be selected and sorted, and each network can be color adapted for easier tracking. Results of a particular scan can be saved later for review.
This is what I use, but you may also like WiFi Scanner that looks and works much the same but has a built-in speed test for each network.