...5 GHz WiFi is more than capable of going through walls. In fact, 802.11ac has significant improvements to multipath rejection, meaning it should perform better in environments with many reflections than the protocols that offer 2.4GHz operation.<p>Which is not to say you may not have had a bad experience with 5 GHz routers&#x2F;access points -- there are plenty of commercial APs that are frankly terribly designed.