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Jeffhs, if you are looking for AM stereo, this was mainly used in car radios. I have found several of these from the late '80's and they did give some stereo separation and it was free of the multipath that you get on FM near large skyscrapers. But there were four formats vying for supremacy and by the time Motorola C-Quam won, there was no market. ESPN and talk radio does not need it. The biggest local station that went stereo used Khan-Hazeltine independent sideband modulation which few people built receivers for.
The only local AM station worth listening to is 1150 CKOC in Hamilton. It features mainly late 50's to early 70's pop and rock.
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