Speaking of unique call signs, one can request it for any of their licensed stations. That's assuming it's available and matches the particular region. (K's or W's) Same goes with moving a call sign from one station to another. As long as you're licensed to operate the station, you can request a call sign be moved from one of your stations to another. It has to be one for one. If you don't have a station in which to assign a call sign to, then you can't just hold call letters.So, if a broadcaster requests a call sign, but doesn't place it one of their properties, how long can they keep it until the FCC takes it back? Or do they even keep track of it to make sure that's been done.