You can contact a company that provide audience monitoring services in Radio, TV or Cable through People Meter technology That will tell you which are the most popular programs, who watch them, etc, etc. there are several company in the country that provides that service.
Any marketing and advertizing company also can help you.
There is actually only ONE company that provides that, and that is AGB.
:: AGB ::
You will not get the data just like that, asking for it, you have to become a client and SUBSCRIBE to their service (costs lots of $$$) or BUY a single report but that costs $$$ as well.
If you approach advertising agency/media central they will give you data unofficially (because they cannot distribute the data even to clients) but you will have to become their client and give them business. So you will pay $$$ either way.
Most feasible approach is to work with an inside contact at some of the agencies, advertising clients or media companies, but not as a client but as a friend. They could show you some data, again they will not give you hard copy. Leaks are penalized by $$$ by AGB. The problem with this approach is that the entity may only have data relevant to its market (e.g. Santo Domingo, not Santiago) or only specific media category (e.g. radio or press but not TV, or Internet but no radio or TV, etc.)
Both Santo Domingo and Santiago are measured electronically for audience ratings and have ad-coverage monitoring (additional $$$).