I'm trying to resolve a connection issue with our generac generator and our xfinity internet-the signal was not strong enough, so I bought this thing.  The signal still isn't strong enough and the generac dealer has told me that I need a cellular module for 300.00 to resolve this issue.  The app on my cell phone indicates that the signal is strong.  Our son has the same generator and optimum with no internet issues (no extender).  any suggestions?