There are 3 areas of regulation that might be implicated by a drone flying over your property - Local, State and Federal laws, rules, and regulations.
At the local level, municipalities may enact ordinances that limit where, when and how drones can be used.
The State of Wisconsin has addressed drone regulation primarily as a "privacy" issue. See Wisconsin Statute - 942.10 Use of a drone. Whoever uses a drone, as defined in s. 175.55 (1) (a), with the intent to photograph, record, or otherwise observe another individual in a place or location where the individual has a reasonable expectation of privacy is guilty of Class A misdemeanor. This section does not apply to a law enforcement officer authorized to use a drone pursuant to s. 175.55 (2).
The federal government, which likely trumps either of the above on this subject, regulates drones through the FAA. FAA publications include: http://www.faa.gov/uas/faqs/#gen
