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kt4ye.
have you looked at the open sleeve antenna in the arrl antenna book?
it may shed some light on your antenna,

from what i can see of your antenna it looks like the feedpoint impedance is a combination of the end impedance of the monopole ( antenna mode impedance ) in parallel with the impedance at the open end of the sleeve transformed through the electrical length of the sleeve ( transmissionline mode impedance ) like an open sleeve or the ssfm,

does eznec show much current in the monopole above the sleeve ?,
does the antenna show to be resonant x=0 on any frequency?

[QUOTE="bob85, post: 401362, member: 18"] kt4ye. have you looked at the open sleeve antenna in the arrl antenna book? it may shed some light on your antenna, from what i can see of your antenna it looks like the feedpoint impedance is a combination of the end impedance of the monopole ( antenna mode impedance ) in parallel with the impedance at the open end of the sleeve transformed through the electrical length of the sleeve ( transmissionline mode impedance ) like an open sleeve or the ssfm, does eznec show much current in the monopole above the sleeve ?, does the antenna show to be resonant x=0 on any frequency? [/QUOTE]

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