Maybe the lack of responses is because of the obscurity of the "s-plane
summation". I've never heard of it, and a web search brought only one or
two possible hits from publications I'd have to buy in order to view.
Any principle with that low a profile on the web is pretty esoteric.

Roy Lewallen, W7EL

Owen Duffy wrote:
I am looking for reference information for summation of field strength
measurements in x, z and z planes to the so called s-plane summation.

Does anyone have any pointers?

Thanks
Owen