I had a metal roof installed and it killed my phone reception.

This isn't a magical device that will pull a signal out of nowhere, but if you get good reception outdoors it will bring that signal indoors

I get great reception indoors and the connection is super reliable with no dropped calls

With proper orientation, I expect excellent reception.

Next, I got out the extension ladder and installed the outside antenna under the eve at the second floor and routed the cable through a side window as far inside as it would allow, but the best reception inside dropped to two bars, same as outside.

Pros: Does the job / improved cell phone signal reception