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Well Homer, I tweaked around on model #5 some more, and honestly I don't think isolating the mast at the hoop is worth the trouble, plus the problems associated with using an insulator.

The pattern is not quite as good and the currents are showing up on the mast, but if they don't cause any noticeable TVI or TVI is not a problem in a particular location, then the added radiation looks to be useful to me...as far as the maximum gain goes.

You do loose a little power in the secondary lobe too, but it looks like to me the A/P with a fully conductive mast is the way to go and that can improve reliability in the mount.

Sometimes common mode currents on the feed line and/or mast can be helpful.

[QUOTE="Marconi, post: 364453, member: 903"] Well Homer, I tweaked around on model #5 some more, and honestly I don't think isolating the mast at the hoop is worth the trouble, plus the problems associated with using an insulator. The pattern is not quite as good and the currents are showing up on the mast, but if they don't cause any noticeable TVI or TVI is not a problem in a particular location, then the added radiation looks to be useful to me...as far as the maximum gain goes. You do loose a little power in the secondary lobe too, but it looks like to me the A/P with a fully conductive mast is the way to go and that can improve reliability in the mount. Sometimes common mode currents on the feed line and/or mast can be helpful. [/QUOTE]

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