1. INTRODUCTION
1.1 Overview of Cosmic Microwave Background Measurements
1.2 CMB-S4: The Next-Generation Ground-Based Cosmic Microwave Background Experiment
1.3 Existing Protections and Interference Criteria for Radio Astronomy
2. CMB INSTRUMENT OVERVIEW
2.1 Background-Limited Sensitivity with Transition Edge Sensor Bolometers
2.2 Optical Coupling to Focal Plane and Photometric Passband Design
2.3 Characteristics of Established CMB Observing Sites
3. RFI COUPLING MECHANISMS AND INSTRUMENT-LEVEL MITIGATIONS
4. HISTORICAL EXAMPLES: RFI MITIGATION EFFORTS AT SOUTH POLE DARK SECTOR
5. COUPLING TO SATELLITE RFI
6. RFI IMPACTS ON OBSERVATIONS AND TECHNIQUES FOR MITIGATION
6.1 Impact of Short Duration RFI Events on Survey Data
6.2 Potential Impacts from RFI on Observing Efficiency and Survey Length
6.3 Potential Impacts from RFI on CMB Maps and Cosmological Results
7. CONCLUSIONS