HD Radio technology has been around since 2002. But American radio stations and manufacturers are finally pushing it. You may have heard the advertisements.

If you're considering HD Radio, there are some things you should know.

Promise of clearer sound

Many people assume that the HD stands for "high definition.' In reality, though, HD Radio is simply a trademarked brand name of iBiquity, which invented and manufacturers the broadcast equipment.

HD Radio does deliver clearer sound than traditional radio. FM stations are broadcast in CD quality. AM stations are broadcast in FM quality. You can definitely hear a difference between HD and regular radio.

HD Radio is transmitted with a digital signal. It is carried within the existing AM or FM signal, much as FM stereo is carried with the original FM mono signal. The HD Radio signal is completely free of static, pops, fades and crackles. Also, HD Radio is less prone to drops and reflections from interference.

Satellite vs. HD Radio

Satellite radio requires a subscription. But with HD Radio, there is nothing to pay. Programming will always be free.