Art wrote:
"Another point I can model two helix antennas one LCP and one RCP
connected at one and and so could Kraus and so can space engineers."

Art should look at page 66 of the 3rd edition of Kraus` "Antennas". Fig.
3-8(c) is the axial-mode helix, an end-fire or traveling-wave antenna.
Here the diameter of the coil is a significant portion of a wavelength
and the distance between turns (6 are shown) ia 1/4 WL. Large loops
(turns) are required to make radiation broadside to the loop instead of
having a null there as in small loops. One would usually not
characterize the axial mode helix as small, though two of them wound in
opposite directions will indeed peoduce both both circular
polarizations. Such an HF structure wouldn`t fit in two ordinary shoe
boxes. Small-diameter coils produce linear polarizations in parallel
with the coil axis.

Best regards, Richard Harrison, KB5WZI