[Elecraft] BL1 Stupid Question

[james at kurtadler.com]

I have a dumb question. I have a BL1. It has three connectors in which 
to make a connection. If I want to use 300 ohm or 450 ohm feedline, 
which connectors am I supposed to use? The connectors are marked 1, 
GND and 2. Would I use the same connectors for a dipole versus a loop? 
Thanks,

James KB2FCV