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Good question NB. I tend to agree with Bob's ideas on the subject.

My free space model for the NV4k with 4 x 107" radials instead of S4's 3 x 90.5" radials...looks to improve the Sigma 4 design by producing a lower maximum angle and some improvement in gain.

I'm also working on the Vector models with different length radiators I posted above, in order to help show how they might respond being over Real Earth, with and without a mast, and using isolation (ISO) of the mast from the antenna.

[QUOTE="Marconi, post: 529632, member: 903"] Good question NB. I tend to agree with Bob's ideas on the subject. My free space model for the NV4k with 4 x 107" radials instead of S4's 3 x 90.5" radials...looks to improve the Sigma 4 design by producing a lower maximum angle and some improvement in gain. I'm also working on the Vector models with different length radiators I posted above, in order to help show how they might respond being over Real Earth, with and without a mast, and using isolation (ISO) of the mast from the antenna. [/QUOTE]

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