So I replaced my 6 year old $40 WiFi n only Tp-Link router with a $350 Time Capsule. I have tried all possible channel combinations, tried placing the router in all possible locations in my house. The signal strength of the TC is always weaker than the TP-Link. I have used several WiFi diagnostics apps to measure signal strength of my connected devices, and whenever they are connected to my old router, the strength is weaker than when I connect to TC. I'm obviously testing 2.4GHz only here since my old router doesn't have AC 5GHz.