The photographer mistakenly though it was a Doppler radar facility that he photographed. Clearly, it is not -- it is obvious that it is an ARSR-1 / -2 type of tower. The North Platte radar is an ARSR-2.
Their web page shows the route they took. It shows that they drove south from North Platte, NE, on US Rte 83. The North Platte radar site just happens to be located south of North Platte alongside US Rte 83 (on its east side).