(In line with the principle of low cost and practicality, I chose a self-defeating directional antenna, using 50-5 for the feeder (the antenna that received ao51 has been useless for a long time, so I dismantled and used its 50-5!), and used a wireless AP and a wireless network card. The AP is connected to the self-defense antenna and placed in the corner of the roof of the unit. Connect to the electricity nearby, and pull a network cable from the unit to go upstairs. At home, the antenna of the wireless network card is replaced with a self-defeating directional antenna, and the core is connected with a 50-5 feeder line of about 15 meters (the signal is lost infinitely, absolutely)
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