We have an Icom IC-745 on board. This boat is new to me, so I'm trying
to figure out how everything is installed, and if the status quo can or
should be changed/improved

What is the best place to connect to ground? Right now, the radio is
not grounded (at least their is nothing connected to the ground plug on
the back of the radio)

Not sure if it matters, but it is equipped with a microprocessor
controlled auto-tuner, connected to the backstay.

Thanks,

Mike.