Perhaps I missed some of this thread, but there is no requirement in PA for a "No Trespassing" sign to have the owner's name and/or address on it. There are a lot of folks who think you do. All that is required is that the signs be posted in a manner that a reasonable person would see them. I've seen some property owners post almost every tree and pole along the road or property line...that's overkill. In most cases one sign might be placed anywhere from 100' to 100 yds. apart. And yes, there are exceptions, due to terrain. It's best to ask your District Magistrate that will hear the complaint what he or she likes as far as sign placement is concerned.
Also, direct communication by the owner, or his agent (neighbor, friend, other family member, employee, etc), a fence, or other barrier designed to exclude someone can also apply...but signs are best for prosecution.