dykesc wrote:
I'm going to 450 ohm window line to my OCF Dipole. Obviously, as
confirmed by EZNEC, without some kind of choking action at the
feedpoint, my feedline will be radiating. What kind of 1:1 choke could
I use on the 450 ohm line at the antenna feedpoint? I could build a
1:1 choke with the right toroid but not sure if I can maintain the 450
ohm line Z0 through the choke.

I'd let the feedline radiate. It's a part of the package.

Also, is there a reason that you wouldn't use coax instead of window
line? Your impedance on amateur frequencies should be such that a 4:1 or
6:1 balun at the (off) center point then a run of coax should work well.

- 73 de Mike N3LI -