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booty,

i posted what mr Cebik said about folding the radial up in the sigma4 alternative viewpoint post,


http://www.worldwidedx.com/cb-antennas/31799-avanti-sigma4-alternative-view-point.html


the mast been grounded changes what length mast would be a bad length for cm currents vs a floating mast, common mode impedance is explained in walt maxwell's "reflections 2"


if you find anything that contradicts w2du or w8ji i would like to read it.