Correct receivers and dish hook up - DirecTV DVR

For Correct receivers and dish hook up, relating to DirecTV DVRs and receivers. Can someone help me figure out what i need to hook up another receiver and/or HDTV in my home?

My regular receiver was hooked up in late 2000. A single co-axial travels from dish to single receiver. Now, i want to split this into a 2nd receiver. Do i need a Multi-switch? Or do i need additional co-axial from the dish.

Also, what will the wiring requirements be if i choose to have an HD dish installed?

Many thanks for your help,