die Station
station / stop
A stop for public transport such as the subway, commuter rail, or bus.
An der nächsten Station müssen wir aussteigen.
We have to get off at the next station.

station
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station / stop
A stop for public transport such as the subway, commuter rail, or bus.
An der nächsten Station müssen wir aussteigen.
We have to get off at the next station.

The correct preposition depends on the meaning. For stops, you say 'an der Station' (at the station/stop). In a hospital or research facility, you use 'auf der Station' (on the ward / at the station).
Ich warte an der nächsten Station auf dich.
I'll wait for you at the next station.
When 'Station' means a stop, the context often includes words like 'U-Bahn' (subway), 'S-Bahn' (commuter rail), 'Bus' (bus), 'Linie' (line), 'einsteigen' (to get on), or 'aussteigen' (to get off).
Unsere U-Bahn-Linie hat 20 Stationen.
Our subway line has 20 stations.
In a hospital context, 'Station' is often combined with medical specialties, for example 'chirurgische Station' (surgical ward), 'Innere Station' (internal medicine ward), or 'Intensivstation' (intensive care unit).
Der Patient wurde von der Notaufnahme auf die kardiologische Station verlegt.
The patient was transferred from the emergency room to the cardiology ward.
In the meaning of 'facility', 'Station' is often the second part of a compound word that describes the purpose more precisely, e.g. 'Raumstation' (space station), 'Wetterstation' (weather station), or 'Ladestation' (charging station) for electric cars.
An dieser Raststätte gibt es eine Ladestation für E-Autos.
There is a charging station for electric cars at this rest stop.
basis / base
'die Basis' and 'die Station' can both mean a fixed place from which work is done. 'Basis' emphasizes that this place serves as a base, that is, as a starting point for missions, trips, or work. 'Station' emphasizes more the facility itself and its specific purpose, for example a 'Forschungsstation' (research station) or 'Wetterstation' (weather station). They can be confused because both occur in contexts such as research, the military, or work in remote places. If the place is mainly for support and as a starting point, 'Basis' fits better; if the equipped workplace is meant, 'Station' fits better.

Auf der kleinen Wetterstation werden jeden Tag die Temperaturen gemessen.
Temperatures are measured every day at the small weather station.
Die Bergretter kehren am Abend zur Basis zurück.
The mountain rescuers return to the base in the evening.