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I this is indeed a "blade" antenna. It is probably some variation of a monopole, maybe with some sort of "top loading" intended to make it appear "electrically" longer and hence operate at a lower frequency than the physical length would allow. You might also call it a monopole or loaded monopole. The flat surfaces are probably driven by aerodynamic issues rather than electrical. A round wire has about 10x the drag compared to a airfoil hence the streamlining.
as you can see there is antenna in e19 reflector+horn
but i think it is not horn
is it horn ?
and if you find paper about e19 and how it works pls tell me or say with which keyword i should search