We have an outbuilding that had coax running to it and had nothing but trouble with it. About 50 feet with line of sight. First extender miserable failed, but the nighthawk x4 really does a great job. We can stream 4k and have multiple laptops connected without a hiccup. Easy 40mbps. Do have the extender and router in the house positioned as close as possible on outside walls. Needs differ per situation, but this worked for us. I think the coax they dug in was not suitable for long underground runs. Previous owner first had two separate connections, but then probably decided to run his own from the house. If you do need coax, ensure you have a good quality coax running between the buildings.
