A communication device includes an enclosure and two antennas rotatably attached to each fixing member. The enclosure includes a pair of sidewalls and a pair of fixing members projecting from a first end portion of each of the sidewalls. Each fixing member includes a plurality of projections spaced from each other. Each of the antennas includes a main body including a first end portion and an adjusting member projecting from the first end portion to adjust the antenna to be in a preferable position to optimize transmission and reception of signals. Each adjusting member includes hooking portions with grooves defined therebetween. The projections move in the adjusting member, resulting in rotation of the antennas relative to the enclosure. Each of the projections is received in a corresponding groove to allow the pair of antennas to be in the preferable position.