yeah I wouldn't say radio signals bounce off walls, but that doesn't mean they will cleanly go through a wall. Its not like your WiFi router is a radio tower. Remember for successful WiFi your router has to get a signal to your PC with minimal packet loss and then your computer has to send a good signal back to the router. To do this through multiple materials and to do it at a high rate of speed is not simple tech like a radio. The information being sent back and forth is massive and every time information gets lost it has to get resent until all the information is received.
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