Did any of you guys bother to look at or read the links that tecnicoloco posted? If you did you will see that none of these three are really quite as simple as CK would have us believe, and none excepting Joel Moell's (2) article is even close to being connected directly to the coax. I think the gist of this thread is trying to suggest that this can be done simply by connecting the coax to the open ends of a quad port.
George Prichard's article (1) use gamma matchers and a choke of some design.
The manual for the Hy Gain (3) uses 2 wires for the driven element, similar to what Homer suggested. There is also a complicated decoupling device used as well, and the Hy Gain surely is not a simple insulator located at a corner port on the Quad element that separates it and allows for a direct connection to the coax feed line as is being implied in most of this thread.
Simple it is not.
When you charge an open port at point A on a quad that has another open port at point B, 90* degrees away with a feed line directly attached, that feed line will become a direct part of the antenna. It might work and maybe it might show a good enough SWR using a long feed line, but I still suggest that match at the feed point is not what you might imagine.
Here is detail B, in Figure 7, in the High Gain Manual that shows the secret decoupling device that we wouldn't have heard about, unless we bothered to read the fine print...instead of just looking at the pictures and listening to the simplistic ideas talked about here.
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I don't mean to be critical of ideas here, but we have to consider the real subject regarding antennas, or be fooled.
