Where tower height in ft (m) is 46ft (14.0m) the focal plane is ft (m).
create table table_25597136_1 (focal_plane_in_ft__m_ varchar, tower_height_in_ft__m_ varchar, PRIMARY KEY (focal_plane_in_ft__m_))
select focal_plane_in_ft__m_ from table_25597136_1 where tower_height_in_ft__m_ = "46ft (14.0m)"