Most people are familiar with ferrite rod antennas as RX antennas. I think this works as the effective size of the rod is "magnified" as the effective permeability is much larger than that of air. This can be used in electric field antennas as well.
As long as the material does not saturate, i.e at very low power, they may be used in TX antennas as well, e.g. in WSPR beacons. Some years ago I carried out some experiments to prove they worked. They would be far down on a "proper" antenna, but they do work. As I recall my antennas were effectively loaded E field antennas rather than H field loops.
As I often say do not be afraid to experiment! This is one area of experimentation that has really been neglected.
See https://sites.google.com/view/g3xbm4/home/antennas/ferrite-rod-tx-antennas .
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