An Eagle in Your Mind Lyrics

Lyric discussion by Hopper 

Cover art for An Eagle in Your Mind lyrics by Boards of Canada

It does sound like 'spent', but wouldnt 'spaced' make more sense? The holts are evenly spaced, about 500 meters apart. and one time listening to it, 'advertise' sounded like 'habitat', again that would make more sense. Don't know if thats correct though. Anyone have any opinions on the meaning or purpose of this song? im curious..