It is generally accepted that Upper Sideband, USB is used on frequencies above 10 MHz and that Lower Sideband, LSB is used in frequencies below 10 MHz. Single sideband is available for use on most of the HF amateur radio bands, although some bands and frequencies are narrow and do not allow the use of SSB.

Should I use upper or lower sideband?

The convention is to use the Upper Sideband on these frequencies for voice communications. Note: Just remember that HIGHER frequencies above 10 MHz (< 30m, shorter wavelengths) generally use the UPPER sideband, and LOWER frequencies below 10 MHz (> 30m, longer wavelengths) generally use the LOWER sideband.

Is upper sideband or lower sideband better?

The upper sideband is suitable for frequencies higher than 10 MHz. However, the lower sideband is suitable for frequencies lower than 10 MHz. People often consider the purpose or benefits of upper or lower sideband Wi-Fi. With the sideband configuration in Wi-Fi, the transmission of the signals is improved.