Your existing antenna is amplified, powered from a supply in the house I presume. The existing coax caries signal down and power up at the same time. A UVSJ often does not pass power through the UHF port which would cause the existing antenna to stop working if you put the UVSJ in line outside. The UVSJ sold by Solid Signal is described as passing power only through the VHF port.
A DB4e will do a much better job receiving the real UHF signals.
A Y10713 or YA1713 pointed at KJRR has a fair chance of receiving the signal from WDAZ though the back simultaneously.
So, to answer your question,
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Could I mount a directional antenna facing toward KJRR and use the UVSJ to combine the existing cable?
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A single amplifier near the antennas can serve both at a very slight cost to signal quality.
To use a setup that uses only one amplifier and coax down-lead,
The output of the DB4e connects to the UHF port of the UVSJ.
The output of the VHF antenna connects to the VHF port of the UVSJ.
The common port of the UVSJ connects to the input of the PA-18 amplifier.
The output of the preamp goes to the power insertion block in the house.
From there, on to the set or splitter depending on your situation.