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That looks like a VHF/UHF combiner borrowed from the analog set, right? It may not be doing such a good job separating the two bands, plus the 300 ohm twin leads may be acting as antennas if the match is poor. In the analog days, you could just look at the picture and fiddle for best results. Hard to say, but you might get better results with a modern V/U antenna with coax cable connection.
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