wifi信号可以传播380-420公里（维基百科）

Distance records

Distance records (using non-standard devices) include 382 km (237 mi) in June 2007, held by Ermanno Pietrosemoli and EsLaRed of Venezuela, transferring about 3 MB of data between the mountain-tops of El Águila and Platillon.^[70][71] The Swedish Space Agency transferred data 420 km (260 mi), using 6 watt amplifiers to reach an overhead stratospheric balloon.^[72]

所有跟帖： 

• 为啥我们这里的网络商都以wifi覆盖整个房子为卖点之一呢?按理能覆盖上百公里的，几十个房子都能覆盖了呀。这卖点不值钱啊。 -月饼歌- ♂ (0 bytes) () 05/26/2019 postreply 16:55:44