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.
EXtreme Radio Service
The range of the eXRS radios is not explicitly stated, however, the manufacturer claims that it is equal to or greater than FRS and GMRS. Since the Earth is curved, the range of two way radios at these frequencies is limited to about 6 miles in good conditions, regardless of the advertised range.