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homer,
the big-mac is a totally different antenna to a sigma style antenna,
its fed the same as a maco/i10k and other endfed groundplanes, where it differes is the mac has an extra 1/4wave section inserted between the end of the 5/8wave and the feed coil,
between the 1/4wave and the 5/8wave sections is a phasing coil,
the vertical rods are connected in parallel with each other and the 1/4wave section creating a fat cage style 1/4wave.

[QUOTE="bob85, post: 262048, member: 18"] homer, the big-mac is a totally different antenna to a sigma style antenna, its fed the same as a maco/i10k and other endfed groundplanes, where it differes is the mac has an extra 1/4wave section inserted between the end of the 5/8wave and the feed coil, between the 1/4wave and the 5/8wave sections is a phasing coil, the vertical rods are connected in parallel with each other and the 1/4wave section creating a fat cage style 1/4wave. [/QUOTE]

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