Wed, 10/05/2022 - 12:07 OOH is a multi-billion dollar industry for one obvious reason - it works. However, you need to have a good creative... Surveys say that companies earn an average of $5.97 for every $1 they invest in OOH advertising. That's almost 6 times the return on investment. Read more about OOH is a multi-billion dollar industry for one obvious reason - it works. However, you need to have a good creative...