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i have seen people say its a 5/8wave so somebody agrees with you eddie, freecell said its 3/4wave while some say its just a 1/4wave groundplane,

the old citizen band magazine article would answer what the astroplane is if we could find it,

i think the lower portion is a tapered transmissionline, the spacing of radials to mast set impedance and radiation angle, according to the patent parallel radials produce radiation angles below the horizon,
mast length also effects radiation angle significantly, which makes me wonder if the optimun length mast for low angle radiation been 1/2wave or 9ft below the hoop @27mhz is to minimise antenna mode currents in the mast,

mine will be isolated and choked about 9ft below the hoop for my own curiosity:blink:

[QUOTE="bob85, post: 207217, member: 18"] i have seen people say its a 5/8wave so somebody agrees with you eddie, freecell said its 3/4wave while some say its just a 1/4wave groundplane, the old citizen band magazine article would answer what the astroplane is if we could find it, i think the lower portion is a tapered transmissionline, the spacing of radials to mast set impedance and radiation angle, according to the patent parallel radials produce radiation angles below the horizon, mast length also effects radiation angle significantly, which makes me wonder if the optimun length mast for low angle radiation been 1/2wave or 9ft below the hoop @27mhz is to minimise antenna mode currents in the mast, mine will be isolated and choked about 9ft below the hoop for my own curiosity:blink: [/QUOTE]

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