A wireless bridge for communicating with another wireless bridge. The wireless bridge comprises a plurality of phased-array antennas, an antenna selector and a transceiver. The phased-array antennas each forms a beam and transmits/receives a signal to/from the other wireless bridge, and the beams are overlapped in angles. The antenna selector is connected to the phased-array antennas for selecting one as a main antenna according to the plurality of received signals. The received signal strength indicator (RSSI) of the signal received by the main antenna is the largest than that received by the other phased-array antennas. Then the transceiver makes transmission/reception via the main antenna.