What is HD Radio?
One of the most popular features of HD Radio Technology is the extra channels that you receive when you listen to HD Radio broadcasts. These extra channels are called HD2/HD3 Channels, and are located on the FM dial, adjacent to your long-time favorite stations. Your local radio stations are inventing all kinds of unique and fun to listen to HD2/HD3s Channels – everything from deep cuts, to classical, to new music formats, to in-language programming and hosts of other creative stuff.
HD2/HD3 Channels are located on the FM dial of HD Radio receivers, like this Zune HD, adjacent to traditional stations.
It’s All Free!!
No subscription or additional fees. You will need an HD Radio enabled receiver. Find one here.
Note: HD Radio products receive ALL broadcast radio transmissions, whether they are HD Radio digital signals or traditional analog.
All you need is a new radio
You will need an HD Radio receiver. HD Radio receivers are available in many forms for car, portable and the home. You can select HD Radio receivers from 17 different automakers as factory installed radios and from leading consumer electronics brands at more than 14,000 retail stores across the country. Prices start at $39.
See all the new HD radio products in cars and at home you can buy, at HD-Get-A-Radio
Source: http://www.hdradio.com/what-is-hd-radio, 3/25/2012