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Ah yes, my favorite type of waves. Wi-Fi. Its a beautiful thing, these modulated electromagnetic waves allow you to stream movies and gain access to the internet with out being plugged in. Once only a coffee shop novelty, it can now be found in every house across the country. But how does it work? Wi-Fi can cover as much as an entire school, or building, depending on the frequency of course. Wi-Fi is a type of wave that can penetrate walls and ceilings, as well as cross rivers and high traffic areas. The Wi-Fi signal is composed of large numbers of different frequencies in order to reject noise in any of them. Also certain materials can make it harder for wi-fi to travel, and also other waves (this is the reason for channel settings) can interfere with Wi-fi too.

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With new modern forms of wi-fi being developed, there are two things to consider: data compression efficiency and raw speed (which is dependent on frequency).  For raw speed, this creates an interesting trade-off: high frequency wi-fi networks can be incredibly fast (some more than 50x faster than normal, not that it matters with most ISPs limitations), but they can't penetrate through walls nearly as well.  That's why modern routers usually operate on two or more frequencies, one for longer range and one for high-speed, in-room connections.

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