Should I buy a U-Channel post or an Econo U-Channel post?
A. If you are going to mount a small sign such as a 12″ x 6″ or 12″ x 12″ no higher than four feet off the ground you can get away with an Econo U-Channel post. However, for sign sizes 12″ x 18″ or larger that need to be mounted four to seven feet above ground level we recommend the regular U-Channel post.