The Atmospheric Science Testbed is based upon the Radiometrics MP3000A mm-wave radiometer at UPRM Physics Building for high-temporal resolution monitoring of coastal atmospheric boundary layer (ABL) of western Puerto Rico. A low SWaP, low-cost spectrum monitoring system from K- to V-bands (22-30 and 50-59 GHz) is being developed to check for RFI that could affect the radiometer observations.