You can use the default audition mastering tool, you could also use the waves plugins but before you master it remember you need to consider the processing your file will go through at the radio station end.
Between the radio desk and the transmitter or stream there may well be a processor which levels and compresses the audio. It’s important to take this into consideration.
For example using the default audition tool you could use 100% loudness maximiser which may sound great in your studio but could sound awful on the air as it would then be double processed.
In terms of mastering for radio less can often be enough.