With FM radio growing in popularity , KUDL began simulcasting its AM signal on 98.1 FM in 1965 .
KUDL played Top 40 music since at least 1956 .
With FM radio growing in popularity , KUDL began simulcasting KUDL 's AM signal on 98.1 FM in 1965 .
KUDL played Top 40 music since at least 1956 .