As an engineer, I used a cellphone app to measure WeBoost effectiveness. It exceeds its stated dbM gain performance figure. However the cell phone must be placed adjacent to the inside antenna to achieve this. So you can't expect significant signal improvement even a few feet away.
If you keep the phone next to the inside antenna, anduse earbuds, it works well. I have even streamed video using WeBoost where signal was otherwise too weak.
I mounted my inside antenna on the small left kitchen counter top near the doorway, and have a USB power port there for charging. It is great for having better mobile hands free phone coverage and use through the Xcite dash radio.
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Dunc, W.CO, 2018 N24D
800W Solar, 10kWh Tesla Coach
Gyrocopter Toad