For most users, other improvements may have a greater impact. Moving the router to a central location, keeping it elevated, updating router firmware, reducing interference from electronic devices, and upgrading older networking equipment often provide more noticeable results.
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Still, the aluminum foil trick remains an interesting example of how simple physics can influence everyday technology. While it won't transform a weak connection into blazing-fast internet overnight, it may help direct Wi-Fi signals more efficiently in certain environments.