I'm not entirely sure I'm using the correct terms here, so I have included pictures.
I would like to add a dish to an outbuilding vs. running a long run of RG6. I have access to an older Slimline dish that I think is called the SL5 - three feed horns on the LNB - but I would like to run just one RG6 cable into the outbuilding from the dish, so I assume I'd need the SL3 setup for this. Also, since it's just going to have only one receiver attached to the dish, would I need to use a power inserter with the SL3 LNB (if it'll work on the old dish)? Here's some pictures... the first one is the old dish I have access to that I think is called the SL5.
And a picture of what I think is called the SL3 setup on a neighbor's roof.