Here in New Zealand DAB is dead, they did a trial then killed it.? Probably because streaming offered much of the same advantages without the need to invest in new hardware and little interest was shown by the public in DAB.? A shame but that is how it goes sometimes.
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There are plenty of AM stations but I suspect FM users outstrip them by a magnitude or two.
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The real driver of AM now is USA politics where it is being mandated for all new car because of the claim it what listeners are demanding.? While there is a notable market segment for AM listeners in the USA I suspect the truth of the demand may be misleading.