Rod,
You really need to know what mix of bead you have. When I
was tearing down W4AN's contest station, every bead I found
(he used hundreds of them) had almost negligible effect on
HF impedance.
There are only a few select types of beads that add enough
common mode impedance to the system to do anything
worthwhile.
If you have access to an antenna analyzer like the MFJ259B,
you could measure them. Otherwise, you may just be wasting
time.
73 Tom
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