Looks like something out of a QDMA magazine.
Your quote seems to indicate he did more than throw up a tower and plant a corn patch.
Thus, some of the responses, including mine.
So, is he a deer-blasting moocher with a tower and corn patch or has he improved his 4 acres with some kind of serious management plan that may or may not impact your 320?
Either way, maybe talking with him would be a start to something at least somewhat amicable.
Agreed that a rifle on 4 acres amid your 320 might give you the willies, though.