I’m wondering if it’s possible to directly connect antennas to the GPIO RX/GND pins or is an external RF IC necesary?
I want to design a few different antennas with high efficiency on specific bands/frequencies, ie. a yagi or array optimized for specific sections of UHF.
If so, are there any drawbacks specific to the flipper that would cause issues with this (harmonics or noise issues without a proper filter?)?
If not, what modules are there that can either be purchased with an SMA/BNC/PL239 connector, or have open source schematics that I can build myself without any obscure ICs?