That setting provides for a single amplification path that covers all pass-frequencies (VHF plus UHF).
Quote:
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I am not supposed to use a pair of UHF antennas on these preamps?
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As noted, "You can give that a try, but do not be surprised if it doesn't work the way you want it to, it rarely does."
See
http://www.hdtvprimer.com/ANTENNAS/merging.html for a discussion.