Eddie,
Henry's models don't claim incresed free space gain, its claiming an increase in signal strength @ 30kilometers when you isolate the mast & coax & add radials,
I think i posted it ass backwards, the improvement with radials is claimed to increase the further away from ground the antenna is,
My test vector is only about 1/4wave from the frozen ground at the moment & i think the cone is too long,
from me to Nav is 4.5miles as the crow flies,
at that distance & antenna height adding the radials & doing no retuning consistently loses me .5dbm or 1/12 s-unit,
its not lab standard measurements but it is a measurement of power at the rx port & not just a relative guesstimate based on agc line voltage in a radio & displayed on a very low resolution s-meter,
HF s-meters are not calibrated the same as vhf/uhf meters,
on HF my 90.2dbm reading equates to a little under s-6, the same 90.2dbm on vhf where im experimenting is 2db over s-9
