Well, good afternoon my favorite antenna theory sparring partner ^^ ab v c^^
I don't necessarily endorse the .64 as a better antenna than a .625 it just seems to me that having more antenna in the vertical plane, as long as it doesn't cause a rise in the toa, is going to provide more receiving area.
On the 5/8 the top has almost no current as the node is going high in voltage so I don't believe that a top hat or no top hat has much bearing on the transmit performance. proven by the identical transmit performance of the Penetrator w/top hat vs Sigma 5/8 w/o top hat.
Also it seems a capacitance hat on an antenna shorter than a 1/4 wave does more than one on a 5/8.
On the Astroplane the 20" long per side cap hat radials make up for almost 4' of missing vertical element, (more than twice their length) but when I have removed a top hat from a 5/8 all I have to do to bring it back to tuned is add to the vertical element about the same length as one side of the top hat.
And that full model length of 284.25" is what?:blink: That's far too long for even a .64, what is that representing? I know that if you remove the I10k top hat and extend the radiator that same 10" you will have a tuned antenna, but if you extend it to 284.25" it will tune around 26.0mhz(.625)-26.5mhz(.64).
If you decide to sell the I10k please let me know.
