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Wisconsin

Wisconsin trespassing laws are similar to those in many other states.

You cannot stealth camp on land which has been fenced, signed, farmed, or is near structures.  You cannot stealth camp on any land that you have been told not to.

You can stealth camp on unsigned "open land" if you have not been told otherwise by the owners.

You should verify this with your own research including possible city and county codes and laws.

943.13 Trespass to land (1e)
(1m) Whoever does any of the following is subject to a Class B forfeiture:
(a)  Enters any enclosed, cultivated or undeveloped land of another, other than open land specified in par. (e) or (f), without the express or implied consent of the owner or occupant.
(am)  Enters any land of another that is occupied by a structure used for agricultural purposes without the express or implied consent of the owner or occupant.
(b)  Enters or remains on any land of another after having been notified by the owner or occupant not to enter or  remain on the premises.
(e)  Enters or remains on open land that is an inholding of another after having been notified by the owner or occupant not to enter or remain on the land.
(f)  Enters undeveloped private land from an abutting parcel of land that is owned by the United States, this state or a local governmental unit, or remains on such land, after having been notified by the owner or occupant not to enter or remain on the land.

943.13 (f)  "Open land" means land that meets all of the following criteria:
1.  The land is not occupied by a structure or improvement being used or occupied as a dwelling unit.
2.  The land is not part of the curtilage, or is not lying in the immediate vicinity, of a structure or improvement being used or occupied as a dwelling unit.
3.  The land is not occupied by a public building.
4.  The land is not occupied by a place of employment.