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Since your local stations are extremely strong, the most likely cause of your channel instability is multipath interference.
Multipath is a condition where signals bounce off of objects (e.g., walls, trees, hills, neighboring buildings, etc.) before reaching your antenna. This can cause multiple copies of the same signal (a.k.a., ghosts, echoes, after-images) to be observed by your tuner. It's a situation where the original signal is interfering with itself because the multiple signal are being observed on top of each other.
One way to combat multipath is to use a more directional antenna. A directional antenna is more selective when it comes to picking up signals approaching from all around. It has a better chance of isolating a single signal path that is less corrupted by excess signal reflections coming from other directions.
What model Terk antenna do you have?
If it is already a highly directional antenna, then you might be able to re-point the antenna for better results.
If your current antenna is not very directional, then you may need to go with a more directional one.
One other thing to watch out for is amp overload. Your signals are so strong that most amps would probably be overwhelmed by this much power. Be sure to avoid using any kind of amp in your setup, including any amps that might be built-in to some antennas.
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