The Asus G751JY has an 802.11n WiFi standard which is better than most portable PCs of this age and type. Most portable PCs that are a comparable age to it have an 802.11a WiFi standard. This notebook PC also have 802.11ac and 802.11b and 802.11g WiFi standards.
An 802.11n WiFi standard is in fact the best Wi-Fi standard across all comparable spec notebook PCs that have been around for around the same time as the G751JY.
An 802.11a WiFi standard is the worst Wi-Fi standard amongst comparable types of portable PC.