Kia of East Hartford has prove that radio advertising works. An article in The Hartford Courant quotes the owner of Kia of East Hartford saying that traffic and sales at his dealership are up after running ads on stations that parodies President Trump. I know I heard the ads on a bunch of stations.
http://www.courant.com/business/dan-haar/hc-haar-kia-east-hartford-trump-20170516-story.html
http://www.courant.com/business/dan-haar/hc-haar-kia-east-hartford-trump-20170516-story.html