Earlier I asked here whether the TP-Link EAP235-Wall Access Point can cover a two-storey house more than 1800 square meters. Feet, every structure is different, but proper placement can be very helpful. I placed mine on the ground floor indoors in the middle of the outside wall where there was a phone jack 4 feet off the floor. The WiFi signal with 2.4 and 5 GHz is very good or excellent everywhere in the house, even in the basement. The signal is good to use in the backyard. Modem, router, HDHomeRun TV tuner were moved to the basement, which significantly reduced the clutter where the devices used to be.
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