Yes they are Free 24/7 in your car or at home radio’s.
DTS sound transforms your Home or Car. 5.1 Surround Sound. Better sound than FM/AM. HD Radio stations broadcast a digital signal over traditional radio frequencies allowing for up to three additional stations of new local content.
Let’s say your favorite local radio station is on 99.9FM. With HD Radio technology, that same station is being broadcast in digital sound on 96.9 HD1. Plus you can access all new content on up to three additional stations: 96.9 HD2, HD3, and HD4. We are on HD4