Note the white, rectangular waveguide running up into the NEXRAD radome. This hollow, microwave "plumbing" is the most efficient way to conduct the 2-4 MHz radar signal.
For more about waveguides, see:
National Oceanic and Atmospheric Administration (NOAA) WSR 88-D NEXRAD Doppler weather radar, station MUX.
This radar is located on a ridge south of San Jose, California, not far from Mount Umunhum.
NOAA Radar Operations Center (NOAA):
About our WSR 88-D Radar (NOAA):