The HD in HD Radio does not mean 'high definition', you cannot use a conversion device on an analog radio to receive hd broadcasts. It is simply the brand name iBiquity has given it's am/fm digital technology. Using digital allows stations to broadcast extra programming that can only be accessed using an hd radio. There is a wide variety of formats to choose from with more on the way as the technology advances. Being free it beats satellite radio hands down!
One big question is "Do I need an antenna?" Probably. If you can get an analog signal but not a digital signal, or the digital drops out,...
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