Todd K. wrote:
My question is how to add the external connection.
The radio has a loopstick ferrite antenna (I presume for only AM) The
loopstick has 4 connection points.

What has worked for me is to wrap a good number of turns
of #30 insulated wire around the loopstick. Ground one end
and tie the other end to an external jack. Run a long wire
antenna from the jack to wherever works best.
--
73, Cecil, W5DXP