No, the CM9521a is not one of the best rotators on the market. It is just about the only rotator available to the typical consumer. ChannelMaster had serious problems with the CM9521a jamming after moving production off-shore a few years ago. I am sure this has since been fixed. There are other, better rotators available, although at considerably higher cost. Ask any ham radio operator. That said, I have a CM9521a, have never had a problem with it, and am quite happy with it.
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