Adafruit RFM69HCW Transceiver Radio Bonnet - 433 MHz [RadioFruit] : ID 4073 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
BY-433-02 : LoRa / ISM 433MHz Omni-Directional SMA Male Antenna – IOT-BOTS.COM
How-to-build-433mhz-RF-transmitter | Hackaday.io
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433 On A Stick | Hackaday
433MHz RF transmitter and receiver
433 Mhz Superheterodyne Rf Receiver And Transmitter Module Ask Kits With Antenna For Arduino Uno Diy Kit 433mhz Remote Controls - Remote Control - AliExpress