In rural Georgia I have 1600 sq. ft, solar-metal home (not only metal walls but also a full metal roof, on which there are 54 solar panels). It’s actually 3200 sq.ft but half is garage, separated by a thick metal wall.
For the residence part of my home this WeBoost 4G, 470103-A cell phone coverage booster kit took me from maybe one bar sometimes/somewhere inside to a consistent, three if not four bars in every spot, even in the two bathrooms.
It was worth paying $20 extra elsewhere to get an extra 360-degree inside antenna (hangs like a cereal bowl from the dead center of my home, just under the roof) plus a handy outside antenna mount, in addition to an in-line lightning arrestor (not clear if that last item comes with all WeBoost kits).
BTW, I bought this "up to 5,000 sq. ft.” model to overshoot my home’s 3200 sq.ft footprint (again, 1600 sq. ft. residence + 1600 sq.ft. garage) and get coverage in my garage, as well as on my 1000 sq.ft. “surround-porch.” I’m disappointed that the Weboost won’t give me 3-4 bar coverage in those two areas (two bars only). I guess it’s tough getting signal to penetrate metal walls bearing foil-pouch (ice rink class) insulation.
On balance, I’m happy.
Special thanks to “Johnny,” in WeBoost’s "Support" department, for handling a problem that arose with buying extension cable (there’s a heavy duty cable option, which I took, but you need to watch out and get the right connectors on it).