Wi-Fi signals struggle through walls not because concrete is thick, but because water in the plaster absorbs 2.4 GHz almost exactly the…

The reason your router falters two rooms away has less to do with mass than with moisture. At 2.4 GHz, water is unusually good at soaking up radio energy — which is also why the same frequency ended up inside your microwave oven.

By How It Works · Aug 20, 2026