I think there's just too much revenue coming from convenience store giant Casey's and world renowned phone juggernaut AT&T that makes this tough. Astoturf sign probably qualifies as charitable donation so the ath. dept. can deduct from taxes.
Let's make a ribbon board go all the way around instead. Then we can do whatever the hell we want. Stone wall? Sure, just press that button. Dillons ad? Ad for Applebeez on Stonetreet ave? Done.