Directv to my shop

Thinking about Directv for my house and I was wondering.  I have my shop in my back yard about 100 ft away (give or take) and I was thinking about putting a TV in there.  If I order a 4 room system can that be considered the 4th room.  If so can there be just a cable run from dish to my shop or will I have to put a 2nd dish.  Really dont wont two dishes on my buildings.

Thanks for any help

tired of cable