Aperture sizing calculations for microwave remote sensing of giant planets. Top: aperture widths required to achieve 2°, 5°, or 33° on-planet latitude resolution for different orbiter distances as a function of wavelength. The sizes of the Juno MWR antennas and a 3.7 m HGA are included. Middle: aperture widths required to achieve 2° and 5° latitude resolution for different orbiter distances. Different curves correspond to the Juno MWR channel wavelengths. Bottom: achievable latitude resolution for a 3.7 m HGA radiometer over a range of orbiter distances for Juno MWR channel wavelengths.