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50 Mhz -> wavelength is 6m

20m x factor 0.66 = 30m

In your testcase, the cable length is a multiple of lambda/2, so impedance transformation will give you Zin=Zout

You should try again with cable length lambda/4

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Let's assume we have an antenna with 200 Ohm input impedance. Cable length is 90° = lambda/4 at 50 MHz.

[ATTACH=full]198080[/ATTACH]

[ATTACH=full]198081[/ATTACH]

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If the resistor is in series (not shunt), it looks like this:

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[ATTACH=full]198083[/ATTACH]