Hello,
you should try the Magnetic Line Balun (MLB).
It is a ferrite (not powderiron) core with a 9to1 ratio.
Take three wires, twist them and turn them around a ferritering.
Set them in series.
The lower winding to the (t)rx het high to the wire.
It simply works fine on the receiver and with a trx with a tuner.

"Dave VanHorn" schreef in bericht
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Decoupling reduces the noise (rf current) traveling on the shield of the
coax, both to, and from your shack, which would otherwise get pretty much
direct coupled to your antenna.