I.....verse with it; it would work to fill a
volume around the antenna. But to get the full effect, it should be a
pretty large volume, containing the electric field in the neighborhood
of the antenna. Not very practical. In coax, the electric field is
between the wires; in the dipole, it's also between the wires, but the
volume is very much larger. On the other hand, people have been
shortening resonant antennas for a long time by increasing the
inductance: thus, loading coils and "slinky" antennas.



Similarly,
people make "slow" coax by making the center conductor a helix, and
thus make delay lines.

Cheers,
Tom

ok what is a 'delay line'??

i would think that would just increase the surface area and therfore
sorta increase performance