page_title: Reflector (antenna)
section_title: Standalone reflectors
hierarchical_section_title: Reflector (antenna) / Standalone reflectors
caption_attribution_description: English: Yagi antenna for UHF HDTV reception. The antenna's main lobe is off the right end of the antenna; it is most sensitive to stations in that direction. Each of the metal crossbars along the antenna support boom is called an element, which acts as a half-wave dipole resonator for the radio waves. The antenna has one driven element which is attached to the TV; it is behind the black box (left). The black box is a preamplifier which increases the power of the TV signal before it is sent to the TV set. The 17 elements to the right of the driven element are called directors; they reinforce the signal. The 4 elements on the V shaped boom (left) are called a "corner reflector"; they serve to reflect the signal back toward the driven element. Yagi HDTV antennas use a corner reflector to increase the bandwidth of the antenna. The rest of the antenna increases the gain at higher channels, while the corner reflector increases the gain at lower channels.
context_page_description: An antenna reflector is a device that reflects electromagnetic waves. Antenna reflectors can exist as a standalone device for redirecting radio frequency energy, or can be integrated as part of an antenna assembly.
context_section_description: The function of a standalone reflector is to redirect electro-magnetic (EM) energy, generally in the radio wavelength range of the electromagnetic spectrum.
  Common standalone reflector types are
  corner reflector, which reflects the incoming signal back to the direction from which it came, commonly used in radar.
  flat reflector, which reflects the signal such as a mirror and is often used as a passive repeater.
caption: Corner reflector part of a UHF television antenna
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