I installed the KAT3 Internal ATU in my K3 during the blizzard of 2009.
I now have the KANT3 Antenna Input Module that I no longer need.
If anyone needs one, I'll ship it to you - CONUS ONLY - at no charge to you.
73 & Merry Christmas,
"H" Cary, K4TM
K3-100 #3491, K2-100 #4991