1. Introduction  
2. The Extended GMRT Radio Halo Survey  
3. Radio Observations and Data Reduction  
4. Results  
4.1. Radio Images  
4.2. A Mini-halo in RX J1532.9+3021  
4.3. Extended Emission Associated with Galaxies  
5. Upper Limits  
5.1. Radio Halos  
5.2. Mini-halos  
6. Discussion  
6.1. Fractions of Radio Halos and Mini-halos  
6.2. Non-detections and Cluster Dynamics  
6.3. The $P_{\mathrm{1.4GHz}}-L_{X}$ Correlation  
7. Summary and Conclusions