I know electric field can't pass through conductors, but I have seen people surround their wifi router by soda can (not entirely) for better signal strength. I want to know what really happens there.

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  • $\begingroup$ Without a picture or a link, it's hard to answer for sure, but there are a lot of examples on the internet of people using metal reflectors to try to boost a WiFi connection. Since multiple, interfering reflections in a realistic room or home complicate the situation, it's often random chance if the reflector hurts or helps a specific connection, but Im sure playing around with it a while, some metal reflectors behind the router's antenna might sometimes improve a connection for one specific WiFi user. $\endgroup$ – uhoh Feb 3 at 14:16

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