Stefan Burbaum wrote:
"Is this old book the only with a description of this antenna?"

No. The new 3rd edition of "Antennas" also has the "clover-leaf" on page
726 along with several similar types.

I`ll speculate that the horizontally polarized omnidirectional antenna
has faded in popularity due to so many automobile FM radios in use.
Vertical or circular polarization may be better for line-of-sight
propagation to an automobile which is equipped with a vertical car
antenna.

Best regards, Richard Harrison, KB5WZI