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Would it be better to use the 300 OHM to connect the two antennas and then the matching transformer on the bottom one
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No
Each antenna should be ready for 75 ohm coax, and then they should be combined with a UVSJ.
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The first sounds more appealing to me because it would eliminate the insertion loss?
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What insertion loss? A UVSJ is a very low loss device. More importantly, it keeps the UHF and VHF signals separate.
A UHF antenna can pick up some VHF signals in addition to the UHF signals. A VHF antenna can pick up some UHF signals in addition to VHF signals.
You only want UHF signals from the UHF antenna, and only VHF signals from the VHF antenna.
With your 300 ohm method, you will have the same VHF signals from each antenna arrive at the combining point. They will interfere with each other if they do not arrive in phase. So also with the UHF signals.
It's almost as bad as trying to combine two UHF antennas aimed in different directions; it often doesn't work.
Why don't you try your method to satisfy your own curiosity?
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Is 3' a good separation between the two?
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yes