Since the router is not intended for outdoor installation, moisture will perform the dirty work over the winter. I suggest installing the router indoors and purchasing one or two Rg58 50 Om SMA male and SMA female cables to install the antennas remotely, such as in the attic. Yes, the two antennas on the router are for receiving signals from base stations rather than disseminating Wi-Fi signals. I've mounted both antennae on the roof using cables that are 5 meters long. The speedtest indicates a stable 15 Mbps connection in a village at a distance of 4-5 kilometers from the base station.
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