The Toughbook 53 has an 802.11n WiFi standard which is better than most portable PCs of a similar age and spec to it. Most portable PCs that were released more than two years ago have an 802.11b WiFi standard. In addition, this notebook PC have an 802.11a and 802.11g WiFi standard.
This portable PC's Wi-Fi standard (802.11n) is actually the best Wi-Fi standard amongst all laptops that are a comparable age to the Toughbook 53.
An 802.11a WiFi standard is the worst Wi-Fi standard across comparable types of portable PC.