I can understand your proprietary feelings toward an area you have scouted and hunt regularly but as others have said, it is public land.
There is a guy here in my area that went to the trouble and expense of building three "Semi Permanent" stands on National Forest land. When I say Semi Permanent, I mean they are chained to the trees as opposed to being nailed or attached with screws which would make them illegal. They are on the verge of being illegal anyway since they are supposed to be removed after the season is over, but these stands have been there for at least five years. He did not use them during the 2000 or 2001 season but he and his wife showed up during the 2002 season and his wife was most emphatic about them being her husbands stands. I have no problem with that, but I do have a problem with not knowing when somebody will be in them and being essentially denied acess to areas because I know somebody else "MIGHT" be there.

Coastie
"Children are tastier than Dogs or Goats and they're far easier for a Leopard to catch" Indian Magistrate Hari Prasad Tivari