The Channel Master 9521a uses the same Chinese-made rotator motor as the NT-105: it's not a solution for you: Despite what Norm says, the Alliance U-110 is a much stronger rotator than the Channel Master and the NTE, and WILL do the job for you. The antennas that you are using are NOT all that big and heavy: no more so than a Winegard HD-8200 or a Channel Master Crossfire 3671
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