I currently have a Terk amplified antenna for both AM and FM reception.
The improvement is good but not dramatic. I tried another model with
similar results.

We will be building a new home soon. My inclination is to purchase an
aerial antenna and assemble it in the attic. This should provide more
dramatic results on the FM band (or so I have read). My question here is
"What should I do to provide an AM signal boost?" Can i lace a loop
style antenna in a wall prior to the drywall being hung? Do i need to
provide a loop antenna in the attic? Is it irrelevant since neither
would be on an exterior wall?

Your help is gratefully appreciated.

Scott