CREATE TABLE table_25597136_1 (focal_plane_in_ft__m_ VARCHAR(255), tower_height_in_ft__m_ VARCHAR(255))
Where tower height in ft (m) is 46ft (14.0m) the focal plane is ft (m).
    
SQL: SELECT focal_plane_in_ft__m_ FROM table_25597136_1 WHERE tower_height_in_ft__m_ = "46ft (14.0m)"