A simple clip to pass antenna wire through and to be held by a carbon 6 pole or pretty much any fishing pole with a decent enough top section (i.e. not the very fine squid pole types).
The simple version should be adequate for most applications but if you need a more robust solution then there's a version with cut outs for a small cable tie to add some additional strength.
detail and infill are not critical
The author hasn't provided the model origin yet.