Solve signal problem

Hi!

We are building a new stable and I would of course like to use my z-wave network there.
Problem is that it’s build out of concrete so I have now signal from Homey into the stable. It’s only about 15m, but the problem is the concrete I think.

Any suggestions how to solve this? I’m not sure a extender would fix it either. Tried to plug in a popp switch but that was unreachable.

Thanks!

I guess the only way is to improve your mesh with more than only one Repeater.
Or you can „upgrade“ a repeater. The description is only in German language, sorry!