Hi Heinz,
I’ve always had the impression that the base-fed halfwave endfed sloper has some directivity towards the direction determined by an imaginary vector from the base of the supporting pole to the base-feed point.
My experience during SOTA activations tends to confirm this. When I setup with my wire sloping towards the NW, I usually have better DX with North-America than when I setup sloping towards the East or North-East, which is what I do in the mornings in order to optimize signals with Europe.
But looking at the EZNEC plots you’ve posted, it seems like there’s no such directivity in one sense over its opossite.
What’s your opinion and interpretation of those plots and your own experience about this?
Thank you.
73,
Guru