It is evident that the more you listen to the Spanish podcast, the more you will improve your listening skills and your pronunciation. You will also increase your vocabulary and you will be able to see the grammar in context.
By listening to podcasts in Spanish you will improve your ability to understand the language in a much more natural way. You will understand much better how a native uses the language, such as the structure of this language and the different tones to mean different words or different messages.