Our trash trucks currently have mobile hot spots in them that provide internet. A single hot spot isn't expensive but when you need one for each vehicle the cost starts to add up.

We have water towers spaced around town. Getting internet to the towers is simple enough. But I am curious if there is something else we could put on the towers that could broadcast a signal that another device on our trucks could pick up thus eliminating the need for the mobile hot spots?

Doesn't need to be fast but should work without direct line of sight - similar to how these mobile hot spots currently work.

Any suggestions?