Improved materials have helped a bit over the decades (things like ferrite) but technology can't change the laws of physics... just make inadequate devices work a tad betteder.
Folks have been trying for nearly a century to make smaller, shorter AM transmission antennas (antennae?). Al the "solutions" end up being less and less efficient. The same applies to reception antennas.
FM has no work around for having to have height and power. This is all the more critical with the degradation of reception antennas... shark fins and windshield embedded... which require more signal to get the same reception as with an old whip antenna.
Kelly or Schrodinger's Cat, any comments?