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Jeff, below is my Sigma 4 model in Free Space that shows what the match looks like at the very bottom of the radiator right above the radial hub.

PDF file below
1, is the front page of my manual showing the length of the radiator and radials I used.
2. is the Antenna View.
3. is a close up of the cone/feed point (O) on wire #2, and right above top of wire #1.
4. is the total field view of the pattern showing the maximum gain and angle.
5. is the Source Data view of the match, SWR, and a perfect reactance.

IMO, I don't see any way we can directly-end feed this design.

Sorry these PDF file images are so faint and I should have made the red (O) FP black (O) rather than red.

[QUOTE="Marconi, post: 670864, member: 903"] Jeff, below is my Sigma 4 model in Free Space that shows what the match looks like at the very bottom of the radiator right above the radial hub. PDF file below 1, is the front page of my manual showing the length of the radiator and radials I used. 2. is the Antenna View. 3. is a close up of the cone/feed point [COLOR=#ff0000](O)[/COLOR] on wire #2, and right above top of wire #1. 4. is the total field view of the pattern showing the maximum gain and angle. 5. is the Source Data view of the match, SWR, and a perfect reactance. IMO, I don't see any way we can directly-end feed this design. Sorry these PDF file images are so faint and I should have made the red [COLOR=#ff0000](O)[/COLOR] FP black [B][COLOR=#000000](O)[/COLOR] [/B]rather than red. [/QUOTE]

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