When your Wi-Fi device is close to a wireless network it can pick up the signals from the router, which connects to the internet. However, it's possible that your Wi-Fi device can pick up two different networks at once. That means that your device will get confused. To make sure that this doesn't happen, you will need multiple antennas. They allow your Wi-Fi device to see the router. These antennas can be connected to the router, or they can be connected to your Wi-Fi device.