47 CFR 95.25 - Land station description.
(a) A land station is a unit which transmits from a specific address as determined by the licensee.
(1) An exact point as shown on the license; or
(2) An unspecified point within an operating area (an area within a circle centered on a point chosen by the applicant) as shown on the license, for a temporary period (one year or less).
(b) The point from which every land station transmits must be within an area where radio services are regulated by the FCC.
(d) A small control station is any control station which:
(2)Is: (i) South of Line A or west of Line C; or
(ii) North of Line A or east of Line C, and the station transmits with no more than 5 watts ERP (effective radiated power).
(e) A small base station is any base station that:
(2) Transmits with no more than 5 watts ERP.