A real Slim Jim
would be fed with a balun so both halves of the matching section are fed
symmetrically.

I've never seen that configuration, just a coax feed to a tap on the
antenna.




This however won't change the radiation pattern. There's nothing magic
about a slim jim, it's just a voltage fed folded dipole so the radiation
pattern will look like a dipole.

Yet most folks experimental results seem to show a radiation pattern
squirted a lot towards the horizon and very little up and down.

Jim