First things first, the cache is NOT AT THE POSTED COORDINATES. Are you an avid radio listener? Do you enjoy hearing baseball games, oldies, country music, religious sermons? How about about those crazy talk show hosts of political persuasion? Of course you are a radio listener! If you're under 40 years old check this out, there's this whole other band your radio can tune to. It's called the AM band. Tune over there right now, I'll wait. Ok back? Sorry, yes, we ALL know how AM radio is inferior to your favorite bluetooth device. I don't need to hear it. But what if you're way out in the boonies with no cell phone service and you want to listen to a baseball game from a field in downtown Minneapolis? Where would you tune? AM of course. See, it's not so bad. On top of that, at night, you can hear hundreds of stations from hundreds if not a thousand miles away. Isn't that cool? Okay, it is for me. Here's a puzzle.
By the way, AM gets a bad rap (there's no rap on AM). You should respect your elders.
You can validate your puzzle solution with certitude.