On both bands the impedance is high. About 300 ohm on 2m and 600 ohm on 4 meter band.
After this, I decided to design networks for a 28 + 50 vertical with trap.
I used the Smith chart program of Prof. Fritz Dellsperger.
Here are some results;
28 + 50 Mhz, both transformed from 50 to 800 ohm
28 + 50 Mhz, both transformed from 50 to 200 ohm
28 + 50 Mhz, both transformed from 200 to 800 ohm
50 + 70 Mhz, both transformed from 50 to 500 ohm
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