There is provided a rear projector capable of preventing entry of dust. The method comprises the steps of exciting, within the antenna, a desired transmission mode and an undesired transmission mode of the signal to be transmitted, and converting, within the antenna, power within the undesired transmission mode into power for the desired transmission mode of the signal to be transmitted. Once exposed to moisture, the sealant will begin to cure. The transfer module transfer a plurality of calls to at least one agent.