There shall be some kind of balun.

Please, please!

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Why?

What's the percentage current unbalance on the balanced line when there's a
450-ohm to 50-ohm, balanced to unbalanced junction without a balun?

What percentage current unbalance does a typical choke balun reduce
unbalance to -

- - - - with a receiving antenna ?

- - - - with a transmitting antenna ?

if there's any difference.
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Reg