On Oct 5, 6:45 am, wrote:
On Oct 5, 8:39 am, wrote:

BTW, you may notice the no feedline 1/2 wave shows
a higher gain than the sloping radial GP.
I'm not sure if this is right or not...
But I didn't tweak the 1/2 radiator.. It's exactly .50 wl
long..
MK

Higher?? You posted 6.34dBi for the half wave, and 6.58dBi for the
quarter wave GP ... Am I misreading something, or was that a typo
about which has higher gain, or what?

Thanks for taking the time to make the simulations and posting the
results, Mark. And thanks to Roy for pointing out that the GP doesn't
fully isolate the feedline from antenna currents. I should say
"pointing out once again" as I know he's posted it before, now that
I'm reminded about it. I don't have time at the moment, but put it on
the list to play with in simulations when I have some time.

Still, the 1/4 wave GP is extremely easy to hack together in an
emergency -- you can even strip a quarter wave of braid off coax and
twist copper wire or coat hangers around the top of the braid for the
GP -- and should perform comparably with other more complicated
antennas. A plus is that you only need to remember (or figure out)
how long 1/4 wave is to know how to cut it to get a decent, if not
perfect, match.

Cheers,
Tom