It's not really possible to boost a signal in an outdoor space. The good news is that it's very possible to boost it in buildings (even large ones) and in vehicles like a truck or tractor. The problem with trying to transmit a boosted signal outside is that it increases the possibility of interference with either the donor antenna or with the carrier's tower, both of which will cause the signal booster to shutdown. If you have a strong booster in a building, you might get some coverage outside but not a lot.
Knowing that you really can only use cell phone signal boosters/repeaters in a building or vehicle, what do you think would be ideal for your situation? Wilson has some really good mobile products that are great for a truck or tractor. The
Wilson Sleek 4G-V and the
In-Vehicle kit are two I've used.
Buildings are a bit more tricky since it depends on the square footage, construction, and the strength of the signal outside. If you let us know a bit more about the buildings you need to boost signal it, we can come up with some recommendations.