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The term 'passive' refers to power for a preamp. In this case, power can pass from the common port to the UHF port, but not the VHF port. This is an important consideration when deciding how to power a preamp but it's not relevant as to what type antenna is to be connected to each port.
The Antennas Direct UVSJ, like other UVSJs filters out VHF signals fed into the UHF port and conversely, filter out UHF signals fed into the VHF port. If you connect a combination VHF/UHF antenna to the UHF port, the VHF capability of the antenna will be blocked. If the same combination VHF/UHF antenna is connected to the VHF port, the UHF capability of the antenna will be wasted.
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