Common wireless router can transmit their radio waves at a range of about 30m (100ft) which should be far enough to give you a strong signal in the next room, right? Radio waves can pass through most of all materials (walls, floors) but can experience issues with materials that conduct electricity. Our bodies can conduct electricity due to the amount of water fluid inside of us. Just us standing there can cause interference with the radio waves transmitted by the wireless router. However, the WiFi technology has the ability to be transmitted over much further distances. The Swedish Space Agency transmitted a wireless signal for the first time over a distance of 310 km in 2002. It was not the ordinary wireless router that you have sitting in your house but instead they used a high-power amplifier with 6 watts power output. Furthermore, they had no walls between transmitter and receiver. Nonetheless, it was a great achievement for the technology back then.
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