Currently Being ModeratedJun 15, 2013 9:37 AM (in response to jlingo527)
Regardless of whether you are using a router designed for 802.11n or 802.11ac, the higher (5 GHz) radio band has greater difficulty traversing through objects like walls. Albeit you should get better range on this band the distance between both base stations and any Wi-Fi interference will still be a factor on performance.
Sometimes just a small placement adjustment of either or both of your base stations will make a significant difference. Please check out the following AirPort User Tip for details.