Hello Ben, and welcome.
It looks like you are near Leonardtown in southern Maryland.
If you aim your 7698 at about 344 degrees magnetic, you will have a good selection of channels. What channels do you want that make you think you need a rotator? They can be a lot of trouble in the winter.
Also, if you have a rotator your TV must be able to add channels after a scan. Can your TV do that?
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(Oh, and btw, am I missing anything?)
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You are missing the parts to ground the coax and the mast, like a grounding block and no. 10 copper wire to connect to the electrical system ground.
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Any preference between a single wire or 3-wire install?
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Are you talking about the rotator connection? It depends upon what model you choose. The CM9521 uses 3-wire. Please elaborate.