Solution you proposed on drawing will give you very weak antenna.
Better solution is to wind multilayer coil (about 5 layers) on ferrite rod
or
to use tank capacitor bigger than 4.7nF. In this case you can use capacitor of 27nF and wind one layer on your 20cm ferrite rod with inductance of about 28.8mH.
or
instead of 4.7nF you can use C of 33nF and coil of 23,7mH.
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