1 INTRODUCTION  
2 METHOD  
2.1 The 21cm Signal  
2.2 Telescope Noise  
2.3 Foregrounds  
2.4 Foreground Removal  
3 EFFECT OF FOREGROUND REMOVAL ON THE POWER SPECTRUM  
4 EFFECTS OF FOREGROUND REMOVAL ON TOMOGRAPHY  
5 EFFECT OF FOREGROUND REMOVAL ON PDF  
6 POSSIBLE IMPROVEMENTS TO FOREGROUND REMOVAL METHODS  
6.1 Maximizing the Ratio of Bandwidth to Bubble Size  
6.2 Large HII Regions as Foreground Calibrators  
7 CONCLUSIONS