If you remove the choke, you will have considerable common-mode current all the way to the shack. You could try shortening the vertical section even to the point of moving the choke very close to the balun. That would result in a 4:1 balun and a 1:1 choke in series at the antenna feedpoint.
Originally Posted by M6BTW
Personally, I would turn the OCF into a center-fed dipole and feed it with ladder-line which doesn't radiate much when the currents are balanced. The balun/choke combination could be moved back close to the tuner.
73, Cecil, www.w5dxp.com
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