I recently swapped out the coax fed OCF dipole for a ladder line fed 134' doublet (non-resonant). Thought I'd post a pic for any wire antenna afficionados. The sweeping line going to the top left is a belaying line used to keep the wire out of a pear tree when raised or lowered. Pull points are the same tree hung lines used for the OCF.
I am using the same 4:1 current balun that was used for the OCF feedpoint for the transition from ladder line to coax for the final run to the manual antenna tuner (the ladder line for the 160m full wave loop occupies the balanced line connection on the tuner). Still no RFI issues noted to date.
(old pic from OCF feed point)
The doublet tune is a bit "twitchy" compared to the OCF, with fairly sharp dips at frequency as opposed to the broader transitions with the OCF. The big benny for the black on black ladder fed wire is that it pretty much disappears when viewed from a distance against the tree filled background. This is especially true when contrasted against the white OCF wire fed by a light grey coax & a red balun!
I tried ladder feed with the OCF, but there were some frequency ranges that did not want to tune to 2:1 or below with any of the baluns tried (1:1, 4:1, 9:1), so I went with the doublet which looks to be usable on all bands tried so far with SWR <= 2.0 achievable & many areas 1.2:1 or less.
The big loop is still the favorite here, though.
Nick