We have the big barn and house wired with video and IR detect.
The other barns are not wired. Not sure someone would want to walk off with a plow or cultivator.
The best is a nice, large, big toothed, trained dog or dogs on the inside of the house. It is a lot of work, but they are fun and NO one will mess with the house.
Need them trained to NOT eat meat unless you que them it is okay.
