The AA-00 ACTIVE Loop Antenna is recommended for optimal reception when used with our legacy MODELS: 520, 634. (Formerly part N 634-01)The AA-00 Active AM Loop Antenna has a pre-amp and requires 12v Phantom power (not included).Comes with mounting brackets.Main Features:The Active AM Loop Antenna is shipped with Mounting Brackets.The AA-00 Active AM Loop Antenna incorporates a pre-amp and requires 12v Fantom power (not included).