The HP Pavilion g7-2220us has an 802.11n WiFi standard which is better than most notebook PCs of this age and spec. Most portable PCs that are a comparable age to it have an 802.11b WiFi standard. In addition, this notebook PC has an 802.11g WiFi standard.
An 802.11n WiFi standard is in fact the best Wi-Fi standard amongst all portable PCs of a similar age and type to the Pavilion g7-2220us.
An 802.11a WiFi standard is the worst Wi-Fi standard across similar types of portable PC.