[jrblasde]

That is an excellent point. I did not notice much change when placing the shield over my prototype board; then again, I did not have the prototype installed in the permanent location and did not have it connected to the chassis ground. I encounter different results if I don’t proactively address the issue now. 

I may go back to the original design of two PCBs. I’ll need to keep the two inductors on the same PCB, but I can put the fixed capacitors and trimmer caps on opposite boards. I’ll have one at the top (trimmer cap facing up) of the IF can and the other at the bottom (trimmer cap facing down).