The story goes that Air Force One was over the UK a few years ago and called up a USAF base "requesting radar."
"What is you position?" asked ATC.
"You got radar, you find us!" Air Force One replied.
After a few minutes ATC announced: "Air Force One we’re changing frequency."
"What frequency are you changing to?" asked Air Force One.
"You’ve got 720 channels – you find us!" ATC replied.