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That's your problem right there; two different signals being fed down the same coax. Each antenna has to have it's own coax. They can be properly joined in a variety of ways, but cannot just be combined. Your tuner can't render you a clean picture w/two antenna signals. Take one of the antennas out of the loop and see how the performance is for the stations it points at. Then try the same for the other.
As for joining them, one way is to use an A/B switch. That's like a traffic light for them - one stops while the other goes. A/B switches can be manual or remote controlled. Another way would be a tuner that accepts two different coax inputs. Some TV's have that.
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