Surely they'd always install the radios above bus/lorry height? Even in low sprawling areas of the U.S. there's sufficient building height available for that?
I specifically meant when it comes to mounting it on the office/house endpoint. Everything else in between should have another flexibility when it comes to choosing the location.
Yes, both ends the tower and endpoint can be mounted higher than a bus, but because most building are single story, they can't be mounted that much higher.
So a small increases in elevation in an area between the 2 points means that the LOS can still be crossed by a bus.