I've been a tech for Dish Network for 12 years & Directv for 3 years. I also was a Paratrooper (509th)...
SWM multiswitches work with your DirecTV Satellite system to distribute the TV service to multiple receivers in your house. The SWM, or single-wire multiswitch, installs directly to the feed from your satellite and can be positioned both indoors and outdoors. Once your multiswitch is hooked up, you can connect the line to a splitter to connect the receivers throughout your household.
11 other experts are backing this answer