More Arduino for Ham Radio – Learn How to Build Arduino Microcontroller Projects for Your Station: ARRL Inc., Glen Popiel KW5GP: 9781625951472: Amazon.com: Books
HamShield Puts Your Arduino On The Radio | Hackaday
Keyestudio Fsk Wireless Shield Rfm69hcw 868mhz Radio Shield W/ Antenna Compatible With Arduino Uno&leonardo&mega&due Board - Integrated Circuits - AliExpress
WiMOD Shield Arduino with iM880B Radio Module - ThingPark Market