Why not buy an external wifi adapter with a large antenna? Would be a lot simpler.
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If a Pi Zero-W: https://hackaday.com/2017/03/07/adding-an-external-antenna-to-the-raspberry-pi-zero-w/
All the other models, you can add a USB-based adapter with their own antennas. For really long range, look up Yagi antennas. However, beware there are regulations on antennas.
Yes, but not easily.
https://youtube.com/watch?v=Y648CjIiEv8
You can do it for other boards by cutting traces and soldering the antenna directly. You can buy antennas from Aliexpress.
Unless your a good solderer, itll be very hard.
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