Thanks for the reply W8RMH! I appreciate it. I'm a little bummed that the BC346XT doesn't come with the standard BNC connection for the antenna like the BC-125AT does, instead it's the screw on connection. Oh well. I'm sure there is a method to Uniden's madness. I see it comes with the adapter, so that's nice.
I have used the supplied BNC adapter for 6 years on three different radios with no problems. It actually helps stabilize the connection. You will never know it is there.