Any idea how to couple a ferrite loopstick antenna
to a car radio input for AM reception?

I experimeted using a 6 inch loopstick and tunning cap
with reasonable results, but I'm wondering what the
best approach is.

I connected one side of the tuned circuit to the
chassis of the radio, and other side to the antenna
input. But the tuning is very broad and I don't get
a very sharp peak when adjusting the capacitor.

It seems the car radio input is very high impedance
and doesn't load the loopstick much.

Would another winding on the loopstick of longer
length work better?

Would a JFET amplifier improve the operation?

-Bill