I did not isolate my antennas back then either Eddie,
i did use a choke and isolate the antenna sometimes but not at the same time & not the right size choke,
never gave endfed antennas somewhere for cmc to flow where it won't cause mischief,
how do i know i had it wrong? my vswr would change with coax length,
i knew about velocity factor 1/2waves & 1/4waves as a kid thanks to my mentor Earnie Ashby G3VDR RIP,
i would trim my coax thinking i was finding a node making the coax a multiple of 1/2waves,
i did not understand that what i was actually doing i was changing the electrical length & common mode impedance of the outside surface of the coax braid seen in parallel with the load,
I do now thanks to Walt Maxwell W2DU RIP.
im interested in seeing what your model with ground tells us.
