The wireless router with the longest range as of 2015 is the Netgear Nighthawk X6 AC3200 Tri-band Wi-Fi router, which covers over 5,000 square feet. The Nighthawk X6 is available from the Netgear website.
The Netgear Nighthawk X6 AC3200 is designed for simultaneous use by several devices throughout a home. Along with its prodigious range, the router divides Wi-Fi connections between devices to ensure the best possible connection.
Wi-Fi distance is not dependent on the router alone, but also varies according to the surrounding structures. Even a powerful router struggles to penetrate thick concrete walls. If your home structure is preventing adequate Wi-Fi support, a Wi-Fi range extender may be recommended.