
der Radiosender
radio station
A company or organization that produces radio programs and broadcasts them on a specific frequency.
Mein Lieblingsradiosender spielt den ganzen Tag aktuelle Hits.
My favorite radio station plays current hits all day.
radio station / radio transmitter
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radio station
A company or organization that produces radio programs and broadcasts them on a specific frequency.
Mein Lieblingsradiosender spielt den ganzen Tag aktuelle Hits.
My favorite radio station plays current hits all day.

radio transmitter
The technical system or facility used to transmit radio signals.
Der Sturm hat den Radiosender auf dem Berggipfel beschädigt.
The storm damaged the radio transmitter on the mountaintop.
The word is made up of 'Radio' (radio) and 'Sender' (transmitter/broadcaster). A 'Sender' is a person or device that sends or broadcasts something, in this case radio waves. So a Radiosender is literally a facility that broadcasts radio.
Der neue Radiosender konzentriert sich auf klassische Musik.
The new radio station focuses on classical music.
The context tells you whether the organization or the technical facility is meant. If it is about the program, music, or presenters, the organization is meant. If it is about technology, a location, or reception problems, the transmitting facility is meant.
Bei diesem Radiosender arbeiten viele bekannte Journalisten.
Many well-known journalists work at this radio station.
When referring to the organization, you listen to or change the radio station. Typical phrases are 'einen Radiosender hören' (to listen to a radio station), 'den Radiosender wechseln' (to change the radio station), or 'bei einem Radiosender anrufen' (to call a radio station).
Ich höre morgens beim Frühstück immer den gleichen Radiosender.
I always listen to the same radio station in the morning during breakfast.