An NTSC television channel as transmitted occupies a total bandwidth of 6 MHz. The actual video signal, which is amplitude modulation, is transmitted between 500 Hertz and 5.45 MHz above the lower bound of the channel. The video carrier signal is 1.25 MHz above the lower bound of the channel. Like most AM signals, the video carrier generates two sidebands, one above the carrier and one below. The sidebands are each 4.2 MHz wide. The entire upper sideband is transmitted, but only 1.25 MHz of the lower sideband, known as a vestigial sideband, is transmitted. The color subcarrier, as noted above, is 3.579545 MHz above the video carrier, and is quadrature amplitude modulation with a suppressed carrier. The audio signal is frequency modulation, like the audio signals broadcast by FM broadcasting Radio broadcasting in the 88–108 MHz band, but with a 25 kHz maximum frequency deviation, as opposed to 75 kHz as is used on the FM broadcast band, making analog television audio signals sound quieter than FM radio signals as received on a wideband receiver. The main audio carrier is 4.5 MHz above the video carrier, making it 250 kHz below the top of the channel. Sometimes a channel may contain an Multichannel television sound signal, which offers more than one audio signal by adding one or two subcarriers on the audio signal, each synchronized to a multiple of the line frequency. This is normally the case when stereophonic sound and/or second audio program signals are used. The same extensions are used in Advanced Television Systems Committee standards, where the ATSC digital carrier is broadcast at 0.31 MHz above the lower bound of the channel.. Which sideband has the most transmitted, the upper or lower sideband?