If you have a computer that has slow wireless networking connectivity, you can always change the card out, but for some people that isn’t the answer. A USB network adapter that supports the faster tech might be easier.
Trendnet is here to help and they have a new USB network adapter that is dual band and will work at 2.4GHz or 5GHz. That means that HD video and other bandwidth heavy things can use the 5GHz band. The adapter has WPS for easy setup and a MIMO antenna for the 450Mbps transfer speeds. It will cost you $90.