I haven't built any antennas in this category myself, but an antenna / flag pole design comes to mind, as well as using screw eyes to hold a wire loop just inches above your roof or shed. Small verticals are also an option.
I would love to add some good options for really invisible / disguised antennas. I know there may be a bit more performance compromise than the home page criteria calls for, but maybe not. If you have good experience with a super stealthy antenna, please write it up and send it along!
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