The EW-711MAC is a single band 5GHz adapter. If you have a router that doesn't support dual-bands, then the EW-7711MAC will not be able to detect your 2.4GHz wireless network. Most public areas that provide Wi-Fi are using 2.4GHz frequency, so the EW-7711MAC will not be able to detect the 2.4GHz frequency in these scenarios.
If you do have a dual-band router and you are still not able to see your 5G wireless network, please check if your router is using a fix channel between 36-48 or 149-165. Our adapters do not support DFS channels between 52-140.