It would require multiple beads at each point, and at multiple points. While
it could be made to work, it would be heavy and expensive. That's why egg
insulators or non-conductive guys are used instead.

While in a balun a reactance of say 1000 ohm would be more than adequate for the
purpose of avoiding radiation (or reception) by common-mode currents, in the
proposed application (guy-wires) a much higher reactance would be required. As
a matter of fact at the top of the tower, where there is a voltage peak, the
impedance is very high, and the guy-wire insulator (either an egg or ferrite
beads) should then show a very high reactance value (probably in the region of
tens of thousands of ohm) not to disturb the antenna.

I never played with ferrite beads, but I have a rather strong feeling that such
high reactance values are hard to obtain at 3.5 MHz just using beads.

73

Tony I0JX