Intro
One of beauties of HF and especially QRP is that you get to build your own antenna. For the first try I went with KM4ACK amazing antenna! It was out of stock, so I had to improvise.
He has a great video explaining how to create the main part which is a 49:1 transformer.
The 3d printed wire winder is what you can find fairly easy based on what you like on the internet and I used this EFHW 3D printed winder.
The Triode is also important, luckily, he provides the specs, and it took couple of minutes to find the one I was looking for online. I used one of BNC connectors I had but they are everywhere.
Remaining would be a real-world experience.