Your Mac doesn't have good Wi-Fi connection? If you have OS X 10.9 Mavericks, you can use the Wireless Diagnostics utility on your Mac to improve WiFi connection.
Does this Wireless Diagnostics utility really work? To figure out this, you should first get some knowledge about what interferes your Wi-Fi connection.
More and more people are using wireless network these days, creating many wireless signals. If all the signals run on the same broadcast channels, your Wi-Fi connection will be interfered. For instance, when your wireless router runs on the same channel as your neighbors', you might find that you have slower internet access.
To optimize your wireless network, one of the easiest and simplest solutions is to change your router's Wi-Fi channel, so you can take advantage of the high speed internet access you paid for and get more done when working at home.
You should first find the best channel Wi-Fi channel and then change your router's broadcast channel to this one, which will be described in Part 1 and Part 2.
On the picture above, the best Wi-Fi channels are 2 and 3 for 2.4 GHz, and 149 and 157 for 5 GHz.
Steps to change the router's broadcast channel varies for different brands of router and the IP address used. Just take my own router with an IP of 192.168.1.1 as an example.
Don't have access to the Wireless Diagnostics utility? Maybe you don't have OS X Mavericks yet? Check the post Everything You Need to Know before Updating to Mavericks if you're about to update to Mac OS X 10.9 Mavericks.