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My guess is that it's because the larger antenna is situated in a spot where it's subject to one of the following:
1. Excessive electrical/electronic noise noise or interference.
2. Multi-path.
3. FM signals, especially if you are using any sort of amplifier.
The key is this hint "85 quality, but it jumps up and down erratically, and causes the signal to be lost frequently" which indicates that the problem is something variable. If it were a defective antenna, you usually would not expect to see this behavior.
The question then becomes one of whether or not there is any rhyme or reason or pattern to the dropouts or if they appear to be completely random.
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