Wi-Fi Booster and Range Extender??

If you are talking WiFi rather than a cell booster, you can't beat a Ubiquiti Nanostation combined with their Air Cube Router. Not automatic, but I've used the combination to provide a solid connection to a Loves truck stop 1 mile away. The Nanostation was mounted on a 6' painter's pole...

Here is a You Tube video showing how to set it up: Nanostation Set Up