Richard Clark, KB7QHC wrote:
"Sonething of a parasitic half Rhombic (or parasitic V)".

Yes, but the rhombic or Vee antenna usually needs sides which are
wavelengths long to produce significant gain. I don`t know what Art has
proposed. The TV antenna on the roof near me looks like a Yagi with its
elements all bent to the same angle with the boom. Their lengths aren`t
multiwavelength even at 200 MHz. Maybe at UHF? VHF gain would depend on
phasing between the reflector and the driven element, and the multiple
directors and the driven element. Thus its performance would begin with
its similarity with the straight Yagi, I`d wager.

Before cable and satellite were available, many configurations were
tried for TV. Some were sold more on appearance than performance.

It`s tough to cover a 4 to 1 frequency range smoothly, but they tried.
Some produced decent pictures at some distance from the transmitters
over many VHF channels. Amazing!

Best regards, Richard Harrison, KB5WZI