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For microwave radar, a classical type of antenna is the antenna aperture. If the “reflector” shape is parabolic, and if the horn is located in the center of the dish, then the rays reflected from the surface will leave roughly in parallel to infinity in the direction x, as the bulb a car headlight is [...]

For technical reasons (the magnetron is not yet not fully mastered), the first radars of World War II working at low frequencies for which it was convenient to use wire antennas. These antennas are well known to the general public because their shape is basically no different from that of the antennae of our radios [...]