47 CFR § 73.3538 - Application to make changes in an existing station.
Where prior authority is required from the FCC to make changes in an existing station, the following procedures shall be used to request that authority:
(a) An application for construction permit using the forms listed in § 73.3533 must be filed for authority to:
(1) Make any of the changes listed in § 73.1690(b).
(3) Install a transmitter which has not been approved (type accepted) by the FCC for use by licensed broadcast stations.
(4) Any change in the location, height, or directional radiating characteristics of the antenna or antenna system.
(b) An informal application filed in accordance with § 73.3511 is to be used to obtain authority to modify or discontinue the obstruction marking or lighting of the antenna supporting structure where that specified on the station authorization either differs from that specified in 47 CFR part 17, or is not appropriate for other reasons.