If he has a place to plug in a network cable on his computer, upgrading to two wireless AC routers like sholling mentions would probably be easiest. If he has an open PCI express slot, you could run a beefy wireless adapter on his end and a replace your main router with something equally beefy (if your main router even needs an upgrade)
Think something like this:
ASUS Dual-Band Wireless-AC1900 PCI-E Adapter $91
PCIe Adapter.jpg
And your main router should match it with at least AC1900 otherwise get something like this:
ASUS Dual-band Wireless-AC1900 Gigabit Router $139
AC Router.jpg
The above setup will give him the absolute lowest latency for gaming over a wireless network, although the two router setup is still decent and the difference will be minimal.
Think something like this:
ASUS Dual-Band Wireless-AC1900 PCI-E Adapter $91
PCIe Adapter.jpg
And your main router should match it with at least AC1900 otherwise get something like this:
ASUS Dual-band Wireless-AC1900 Gigabit Router $139
AC Router.jpg
The above setup will give him the absolute lowest latency for gaming over a wireless network, although the two router setup is still decent and the difference will be minimal.


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