Abstract: Shared aperture multi-band antennas (e.g., metasurface electronically scanned antennas (ESAs), etc.) are described. In some embodiments, an antenna includes an aperture having a plurality of multi-band radio-frequency (RF) radiating antenna elements, wherein each antenna element of the plurality of multi-band RF radiating antenna elements is configurable to operate at any of multiple bands. In some embodiments, the antenna also includes a controller coupled to the plurality of antenna elements to dynamically configure said each antenna element of the plurality of antenna elements to operate at each of the multiple bands at different times.