A device for transmitting and receiving electromagnetic radiation includes separate antennas for transmitting and for receiving electromagnetic radiation and in which the lobes of the transmitting and receiving antennas are focused by a shared focusing arrangement. The elements include two oblong holes formed in the limbs and a third oblong hole formed in the tenon. A first parabolic reflector is formed within the body and has a wide portion adjacent the open end and a narrow portion spaced therefrom along the longitudinal axis.