True that the isolation between ATN1, ANT2 and RX Ant are poor. The solution is to use a preamp in receive antennas so that signals from RX and TX antennas are similar in strength. Ignacy -- View this message in context: http://elecraft.365791.n2.nabble.com/K3-ANT-1-2-isolation-tp7500652p7503048.html Sent from the Elecraft mailing list archive at Nabble.com.