Get an old R-390 if you are a hobbiest. A big old military .3 to 30 Mhz receiver. Tube type, heavy, guaranteed not to fit in your pocket, not meant to be portable. Tight front end, good sensitivity and selectivity.
I once used one on an LST in the SW Pacific near Australia to listen to my favorite AM station out of Portland, OR.
Pricey and hard to find, tho...