I Posted the same info below , but have to disagree. We had zero signal outside according to our phones … we put in celfi go-x…strongest booster on the market and took the grid parabolic option which they claim up to 20 miles in perfect conditions …ie direct line of sight …we were about 13 miles...
Hi, Just wanted to point out that no outside signal does not mean you’re out of luck … we used a grid parabolic antenna that pulled in signal from 18 miles away…paired it with a celfi go x and had amazing coverage