I've used the 3G repeaters with success. Sold a couple to some clients. One whose house was redone a few years ago with foil faced rigid foam insulation on the outside, lathe and plaster walls inside, and new windows with reflective coating. Barely got any signal before the booster, now get acceptable-good signal through most of the house.
We have used the Wilson products and, for what they are, they work. If you want a real, "big boy pants" solution, Tesco has the answer. It's not cheap, but it works, period! We installed two of these and no matter where you are in the buildings or campus, you get full bars and uninterrputed signal. Click Here