The standard antenna connector is a 50 ohm BNC. If the K2 has the built-in ATU, then the standard BNC socket is capped and there are an additional 2 BNC sockets from the ATU, selectable ANT1 and ANT2 from the front panel.
Estimating the value of a rig can be challenging. We collect prices paid by real hams over the years to help you estimate the value of a used Elecraft K2. Just bought or sold this model? Let us know what you traded it for and help other ham operators!
Based on historic data, today's second-hand price of the Elecraft K2 is around:
These estimates are based on the following prices: