The issue isn't about towers. The issue is that most of these restrictions prohibit any type of antenna. Most hams do not have a tower. They have dipoles, loops, and other wire antennas that have less visual impact than HVAC units on rooftops. However, we shouldn't be limited to wire antennas either. If someone chooses to participate in VHF/UHF activities in the hobby, wire antennas in trees aren't a very good compromise.