Because of "skywave Interference," what must some AM stations do?
A) Only broadcast at night
B) Sign off at sunset
C) Nothing- not subject to constraints
D) Switch to another frequency on FM

Question

Quizplus · Accepted Answer

Skywave interference occurs when AM radio signals bounce off the ionosphere and travel long distances, interfering with other stations. To avoid this, some AM stations must sign off at sunset to prevent interference with distant stations that share the same frequency.

Because of "Skywave Interference," What Must Some AM Stations Do