I will go ahead source and get the MoCa 2 rated two way splitters and try that. Each location has it's own panel and ground one building has it's own electrical service on a different distribution transformer. The new building will have the RG11 routed from the existing garage underground...
When I bought my house the satellite tv antenna was mounted on the roof of a detached garage with RG6 quad shield cable going to the receiver underground to the house. I didn't use the dish so I repurposed the cable for MoCa 1.0 protocol to get network connectivity to the garage. So I have on...