Broz
WKR
If you want to put up signs, here is what has worked well for me. Normal signs will be torn down and tossed over the hill before you get back to the house. Usually each state has a color to indicate private property, Montana is Orange, I drive a T post, and be sure its on your property, then slide a 2" schedule 40 pvc pipe over it painted orange on the top and leave it white on bottom half. Then drill with cordless drill and secure it with a 1/4" bolt and double nuts locked together. Cap the top for a more professional look. It is durable, very visible and offers a professional looking warning of boundaries. All of these I have put out are still in place years later.