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so just to check in, Ill probably pick up a 91xg and replace the db 8.
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I think it is worth a try if you are willing to experiment, but I can't guarantee it will improve your reception. The 91XG does have a gain peak at the high end which pulls ch 40 up, and the front end can be tilted up to catch the signals coming down from the peak.
http://www.hdtvprimer.com/antennas/comparing.html
Look at the Net Gain curves M and P for the 91XG and DB8.
Because the KNSD signal is scattered by the mountain peak, the wave front of the signal is non-uniform, so it will have hot spots and cold spots. It is worth the trouble to try slightly different locations as suggested by Tower Guy, not only of height but also left-to-right horizontal movement. Antenna installers call it "walking the roof."
http://forum.tvfool.com/showpost.php...5&postcount=34
http://forum.tvfool.com/showpost.php...6&postcount=35
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Will a cm 7777 or 7778 be helpful or just the antenna replacement?
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The 7778 has about the same gain as your CPA19 unless it is defective. The 7777 has more gain and might help.
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Also would it be worth it to point to any of the nbc stations to the north?
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I doubt it. KNBC is a LOT weaker.