PV extender

We have installed in the Solar PV array at, connected to this are 3 inverters (large white boxes near to the big door opening on Bay 2).  Each of these has a Wifi stick inserted underneath and these need to be able to connect to a Wifi network in order for us to set-up and receive the data to monitor how the system is performing.  From the attached screenshot from my iPhone you will see how these Wifi sticks identify themselves, but I need to be within about 5 metres of the inverters in order to pick all these up.  What I was hoping you could do is install a wifi extender aerial and locate that on the steel upright stanchion nearest the inverters in order for them to connect themselves up with the internet.  Is that feasible for you?