FM broadcasting
VHF Radio waves do not travel far beyond the visual horizon, so reception distances for FM stations are usually limited to 30–40 miles (50–65 km) They can also be blocked by hills or buildings.
Valley Public Radio
Despite having no translators, the two stations' combined signal covers most of California's San Joaquin Valley, including the cities of Fresno, Bakersfield, Visalia, Madera, Tulare, Clovis, Merced, and Hanford; however, much of this area gets only grade B coverage. KPRX operates with its maximum allowed U.S. Federal Communications Commission power (11,000 watts) for a Class B1 station with an antenna height of 152 meters; likewise KVPR broadcasts with its maximum allowed power (2,450 watts) and an antenna height of 576 meters for a Class B FM station. In FM broadcasting effective radiated power is inversely proportional to antenna height.