Cannot get a secondary signal

I have the same issues.  
Tried a panel antenna but it didn’t seem to help.  
Cellmapper just doesn’t cut it.  
Have you looked at Ookla’s 5G map?  Google it.  
Supposedly it is from trusted sources and their own data.  It is updated weekly. 
I don’t know accurate the indicated cell tower locations are.  Maybe this will help all of you.  I really want this to work well.  I want to kiss Spectrum good bye.