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HD radio tuners can be purchased from many different stores, online and offline. Some examples of stores that sell HD radio tuners include HD Radio, eBay, and Walmart.
As of 2012 there are four satellite radio receivers recognized by the International Telecommunications Union. There are two European systems, which are DAB (digital audio broadcasting) system and the DRM (Digital Radio Mondiale). Then there are the Japanese ISDB-T and the U.S. HD-Radio (IBOC).
One can purchase a HD radio receiver from the following sources: HD Radio, Best Buy, Quantum AV, Tesco, Home AV Direct, Hi Fi Gear, Amazon, Crutch Field, to name a few.
To find the serial number on an HD radio, look at the back or bottom of the radio. In most cases, the serial number is marked SN and is located on a small plate or tag at the bottom or back of the radio.
"HDTV" is high definition TV, so naturally, it's easy to understand that "HD" radio is high definition radio. Except that it's not. "HD" radio originally stood for "Hybrid Digital" radio. Now it's the trademark for iBiquity's in-band on-channel (IBOC) digital radio technology used by AM and FM radio stations to transmit audio and data via a digital signal in conjunction with their analog signals. According to iBiquity's website, the "HD" is simply a brand name and has no meaning. There is no connection with HDTV, although like HDTV, the HD Radio specification provides enhanced capabilities over the old analog format, such as 5.1 surround sound.