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Try it, but most likely it won’t perform very well.
For starters, the Talking House auto-antenna tuner is designed to work with about 10 feet of wire. If the “long wire” antenna is some multiple it might tune up. Otherwise, the tuner will error out not being able to tune the wire.
Next, the “long wire” will most likely be horizontal and not very high. It will exhibit directional characteristics with many null points meaning the signal will be very weak in several directions, strong in others.
But hey, try it! Sometimes some unusual combination of variables will work just fine.
Don’t forget to try the “remote ATU” connection. That is a direct output that does not use the internal auto-tuner. And, you could home-brew a simple tuner to resonate the “long wire.”