This is the 14773rd most frequent Polish word.
radiowych
"Radiowych" means "radio" (adjective, relating to radio) in English.
Here, "radiowych" is an adjective describing "fal" (waves), specifically indicating their nature as being related to radios.
Antena radiowych fal jest ustawiona na dachu.
The antenna for radio waves is installed on the roof.
In this sentence, "radiowych" modifies "audycji" (broadcasts), specifying the type of broadcasts as those pertaining to radio.
Słucham audycji radiowych codziennie.
I listen to radio broadcasts every day.
Here, "radiowych" describes "częstotliwości" (frequencies), emphasizing their relation to radio communication.