N.H. Rev. Stat. Ann. § 422-B:1

The safety, welfare and protection of persons and property in the air and on the ground and of the maintenance of electronic communications within this state require that the navigable air space overlying the state and the approaches to and the air traffic pattern area of any public airport in this state be maintained in a reasonably unobstructed condition for the safe flight of aircraft. To that end, the location, height, and identification of structures, and the use of land thereto related, are regulated.