Ladder - can be old with missing rung(s) - for tree (Wolverton MK12)

We have a large tree, which I need to get up periodically, to prune.
There is an ideal spot in the tree to fix half a ladder (maybe six or seven rungs) so I can proceed up further once I get off the top of my step-ladder. A wooden ladder will probably look most natural in a tree, but can consider metal. If you have a longer ladder, that is also a possibility. Thanks for reading