Affirmative — Yes
Negative — No
Reading you Five / Loud and clear — I understand what you say 5x5. (in reference to call clarity)
Over — I have finished talking and I am listening for your reply. Short for "Over to you."
Out — I have finished talking to you and do not expect a reply.
Clear — I have finished talking to you and will be shutting my radio off.
Roger — Information received/understood.
Read / Copy — Do you read me / understand.
Copy — I understand what you just said (after receiving information).
Wilco — Will comply (after receiving new directions).
Go ahead — Send your transmission.
Say again — Please repeat your last message
Standby — Pause for the next transmission. This usually entails staying off the air until the operator returns after a short wait.