This dataset contains ground-based radiometer observations from the University of Manitoba Surface Based Radiometer (UoM SBR) at 19, 37 and 89 GHz taken during Leg 1 to Leg 5 of the MOSAiC campaign (October 2019 - September 2020). Included are the raw observations and quick-look, uncalibrated quick-look brightness temperatures. In addition, images, automatically taken from a camera mounted on the instrument are provided. Details about the data format, usage and the instrument can be found in the file Data_manual.pdf.