Can anybody explain to me how he can legally use amateur radio bands to communicate with this drone? He is a licensed ham, but the device is neither a beacon nor a repeater (and both would need a callsign, at least where I live).
FCC 97.215 [0] makes it legal for a ham to transmit up to 1W in any band they're licensed for for the purpose of model aircraft control, without any callsign identification being necessary.