OT: wireless Dog fences

Do any of you have a “containment” system for your dog?

We live on a farm.  We’re looking for a wireless (to avoid digging ditches and burrying wire) system to keep the dogs from our ag-bag area and from following our vehicles out along the road.

There are so many systems out there – it’s so confusing! I’m hoping some of you can help me narrow it down a bit.

Thanks!

Karen