A motorized window treatment may comprise an antenna that allows for wireless communication. The motorized window treatment may comprise a roller tube, a motor drive unit, and at least one mounting bracket. The roller tube may be configured to windingly receive a flexible material and to be rotated to raise and lower the flexible material. The mounting bracket may be configured to support a bearing assembly of the motor drive unit to allow the roller tube to rotate with respect to the mounting bracket. The bearing assembly may be located between the roller tube and the mounting bracket, so as to form a gap between the roller tube and the mounting bracket. The antenna may comprise an electrical conductor wrapped around the motor drive unit adjacent to the gap between the roller tube and the mounting bracket.