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OTA stands for over-the-air, referencing a form of transmission of television signals. Oftentimes, the author is writing in the context of HDTV transmission. This is in comparison to QAM and satellite service. One key advantage of over-the-air is the fact that is requires no paid subscription service to receive this form of television. However, the user is confined to the channels broadcast in their area and the physical quality of their antenna system.