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Dave is exactly right.
When you're combining antennas from different bands, you need to use a diplexer that isolates the low-band antenna from the high-band antenna. The UVSJ (Dave had the V and S transposed) is the ideal diplexer that splits between the VHF and UHF bands.
Antennas connected this way can perform as if they were operating independently (no loss of performance).
Some pre-amps (like the Channel Master 7777) come with dual inputs (one for VHF and one for UHF). These types of amps will internally combine the signals (like the UVSJ) and amplify them at the same time, eliminating the need for an external diplexer.
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