have a direct tv satellilte, not hd, and wish to do a long run to a barn about 400 feet away. the satellite has a dual run of about 50 feet to a 4 way splitter, 3 of which I have hooked to tvs in the house. I have a fourth receiver that I don't need in the house and wish to use the fourth run to the barn. I also have plenty of underground rg 11. is it possible to run the signal 400 feet? do I need an inline amp? thanks to all the gurus who can help!