Steve, Here is a chart of wire gage versus current capacity for power transmission. Gage Amps 12 9.3 14 5.9 16 3.7 18 2.3 20 1.5 The K2 10W version uses 2.0 amps for transmit and up to 0.250 amps for receive. It looks like 16 gage wire would work fine. If it were me, I would buy the connector from Elecraft. 73 Larry KB5DXY