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Broadcast Data Systems (also known as Nielsen BDS, BDS or Luminate BDS) was a service that tracks radio, television and internet airplay of songs.The service, which is a unit of MRC Data, is a contributing factor to North American charts published by co-owned magazine Billboard, including the Billboard Hot 100 and Canadian Hot 100, when combined with sales and streaming data from Soundscan.
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English: Diagram of the electric fields (E) and magnetic fields (H) of radio waves emanating from a quarter-wave monopole radio transmitting antenna (small dark vertical line in the center). The diagram is a cross section of the three-dimensional radiation pattern, which is symmetrical about the vertical axis of the antenna (vertical dotted line) .
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