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Advanced is a class of the past and there still a few advanced class license holder out there, however they are dying out literally. It is a class between General and Extra and is no longer an obtainable class. Only Technician. General and Extra are available form the FCC. When the FCC changed the classes they should have automatically upgraded the Advanced class to Extra, however they saw fit not to. To move from the Advanced class to Extra you still have to take the Extra exam so many of these class holders chose not to. The band privileges are almost the same, only slightly different and in my opinion not worth the trouble to take the Extra exam.
John N1HM