I'm using a Time Capsule as my router, and when using airplay from my patio, the signal occasionally gets interrupted. There is one room (kitchen) between the room where the Time Capsule is and the patio. So, I added an Airport Express to wirelessly extend the network and placed it on top of a kitchen cabinet which is against the exterior wall adjacent to the patio. I thought this would give me a stronger WiFi signal on the patio, but I'm not convinced it has helped. 1.) Since the TC and the AE are only a room apart, is this to close? 2.) Since they're both the same SSID, is there any way to know if/when my iPhone is connected to the AE vs the TC? (perhaps an app?) 3.) Is there an app to more accurately measure WiFi signal strength? 4.) Any other advice?