Yes, we get royalties. It is hard to say how much exactly. If you sold many broadcast licenses and everything is set correctly, it is something like $$$$, sometimes even $$$$$ per year. Keep in mind that year after year it is rising significally.
But even if you have one track broadcast in TV, you can always have a lucky shot which will give you $$$$ or more.
More info here: The AJ Community Guide #2 - Performing Rights Organisation Royalties (PRO)