From N2AL
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"That is correct. If you are licensed in Alaska you can take the call with you if you move to to another state. There is a ham in Tennessee with a KL7 call who did that."
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Both my father and I have held onto our KL7 callsigns, though our mailing address's are now Lower 48's.
This isn't too unusual for Alaskans to do... adds a bit of zest to breaking a DX pile up, though not near as zesty as two of my friends, one with an AH3 (formerly KJ6) and another; AH9 (formerly KW6.)
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Of esoteric trivia, when I last looked at all the prefixes available- KX6 is specifically excluded. I used to be one, and would consider the swap but they are, strangely, off limits (they were never issued by the FCC; the KR6 and others-- but unlike KR6, KB6, KC4, 6's- et.al......that were previously issued by military and government authorities but are now FCC or shared *-- the KX6 prefix isn't... a mystery!)
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.................................CF
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*KC4 - Antarctica