You can use litz wire, but, really, unless you're trying to build the super duper antenna for LF reception, don't worry.
Buld a loop antenna using either an air variable or Polycon variable scrounged from an old radio and some old coaxial cable. Tune it. place your sense antenna in the field of the tuned circuit and enjoy.
Look for WBZ in Boston, WLS in Chicago, WMAL in DC, WABC in NYC, WSM in Nashville and so forth. These stations are so powerful that you'll hear them without difficulty in most radios at night --without much of an antenna.
And gosh, if you can't hear those stations, then things must be so dire that it would be wise to hunker down and hide.