Hi Group,

Let's say I have a 15 meter dipole. If I were to take a ferrite core
and place a core along the dipole for the lenght of 6 meters, having
two cores on either side.

The question is would this antenna now work as a dipole on 6 meters but
not on 15 unless the reactance of the core was low at 21 MHz?

Does the core act as a RF block but not as a inductance with a
reactance at 15meters?

If it is a inductive reactance, then reducting the lenght of the dipole
would bring down swr on 15m.

I have seen the ferrite emi cores which clamp around the wire, would
these work for 100 watts?

If I had a way to move the cores along the dipole, I could create a
multiband antenna, true?

I am sure there are better ways to do such, aka trap dipole but I like
to give this some thought.

De KJ4UO