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You can probably use one or both of the antennas subject to a closer inspection and identification.
The upper antenna appears to be an older CM 4221. Put a new balun on it and it will likely be fine. The old combo might also be used instead, get a balun for it also. You do not need nor should you install any amplifier, a standard splitter should do fine.
Do some maintenance on the existing antennas and see what ou get one at a time.
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