I used Orange Prusament PETG. This would work fine with almost any filament.
No supports are needed.
BOM
I used the following parts..:
2 x M3 thread inserts
2 x 10mm x M3 cap head bolts
4 x 3mm washers
2 x 3mm Fork connectors
Small amount of 3mm heatshrink
1 x BNC-F to BNC-F barrel that had a 10.5mm central collar diameter.
The antenna wire and counter-poise wire can each be fitted with a 3mm fork connector and connected to the antenna leads on the screw posts.
I love the portability of Adam's QRP Antenna.
Note: I am NOT affiliated with K6ARK.com in any way other than being a customer and user of Adam's product.
The author remixed this model.
This remix adds the ability to hold the QRP Antenna from Adam at K6ARK.com (@AdamKimmerly)