I have a 2G/5G wifi router from my cable company located in my home office. The wifi works fine in the house. But in the garage the signal is very weak. It's maybe 50ft away but it's through about 4 different walls including a steel door. 

The TP Link AC750 wifi extender that I just purchased doesnt really solve the problem. It works. The lights are all green and I see the wifi signal in my list of available networks on my phone. But it doesn't increase the download speeds. I just tested my speeds with an app on my phone and switching between being connected to the extender and to the router. Here's what I have:

1. Standing next to my wifi router connected to the router's 5G: 350 mbps

2. Standing in the house next to the garage door connected to the router's 5G: 151 mbps

3. Standing inside the garage next to the extender connected to the router's 5G: 100 mbps

4. Inside the garage next to the extender and connected to the EXTENDER'S 5G: 84 mbps

So inside the garage, which is what this is about, the extender provides slower download speeds than the router does.

If I move the extender into the house and put it next to the garage door, I get:

1. Inside the house with the extender in the house connected to the extender's 5G I get 81 mbps

2. In the garage with the extender in the house connected to the extender's 5G I get 77 mbps

I am better off without the extender.

Is there a trick to getting better performance through the extender? Or is there a different device that would get me faster wifi speeds in my garage? It would be possible, but not easy, to run an ethernet cable from the router into the basement, across the basement ceiling and into the garage. But once the ethernet cable is in the garage what would I connect it to? It wont connect to my phone or to my laptop.

Thanks for any help.