Transmitted (7)
'transmitted' is the definition.
(sending is a kind of transmitting)
This is all the clue.
(Other definitions for sent that I've seen before include "Caused to go somewhere" , "charged with emotion?" , "Posted" , "old money in Tallinn" , "Thrilled" .)
(Other definitions for radioed that I've seen before include "consulted with frequency" , "Broadcast" .)