

Usually that kind of thing is done through a bond measure. The increased tax isn’t enough to pay for a big project while it’s under construction. Big projects are financed by selling bonds. Those bonds need to keep being payed back well after the project is complete.
The issue is the ambuguity in what someone intends when they just say radiation. It is valid to call any electromagnetic wave radiation. However, as for health concerns, what matters is “ionizing radiation.” Microwaves are too low energy to be ionizing, so they don’t match what most people think of when they say radiation with the implication of ionizing.