I have one main and 2 nodes. My summerhouse is approximately 20 ft from my house with 1 cavity wall a wooden fence and the summerhouse timber wall between the nearest node to the node in the summer house. I can't get the summerhouse node to get anything  more than poor signal (1bar). What can I do to increase this signal.

The second node has a high signal from the main deco. I csnt backhand any nodes. Could I use a powerline adapter from the modem/router plugged into the SH node?