I’ve got a BT home hub in my house. I’ve got an outbuilding in the garden. There is an Ethernet connection in the outbuilding then hard wired connections to my av equipment working of a tp link 5 port extension. I want to have a wireless signal in the outbuilding so I can do some work from home out there on an iPad and laptop. What equipment do I need to do this? (I’m clueless about these things).