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Based on your test, you need to move the CM3018 outside. It looks like your attic is not an acceptable reception site.
If the attic is too difficult to deal with and you prefer to abandon the attic antennas in place, buy a Winegard HD7694P and mount it outdoors where it has a clear shot at about 345°.
If you go with the HD7694P, try it with no preamp, especially not the CM7777 which will overload. If you don't get enough signal power to split reliably, an Antennas Direct CPA-19 preamplifier would be my choice.
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