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https://hanzama.x0.to/2020/05/21/a-wi-fi-transmitter-that-can-stabilize-radio-waves-on-a-wireless-lan-is-also-a-cheap-and-cheap-but-the-nikkei-xtech-is-a-major-source-of-the-wi-fi-hotspots/
無線LANの電波を安定させる「Wi-Fi中継機」、手軽で安いが欠点もある(日経 xTECH)