Cross Country RC Flight - Need Permits, etc?
90 miles, whow. I hope you have a full tank! A convertable car with 2-3 pilots to share the flying would be good. It sounds like a good stunt.
I don't think this is going down as the crime of the century! In fact, you could alert the cops, they might escort you out of town!
I assume there are no other RC fields on the route.
The cell phone towers aren't a problem as far as I know. If you're worried, you could do a range check in the area, but I've never heard that it's necessary to avoid them.
Tom