So, I did a little digging because of course I did and here's what I can find...
CowpokeRadio.com was registered as a domain on August 24, 2016. The first Facebook post was August 31, 2016. And the next day, September 1, 2016, a post contained this:
Cowpoke Radio broadcasts locally on AM and FM, and all around this cotton-pickin' planet via the Interwebs.
Here's Banta, CA:
View attachment 5065
Tracy, which has become a bedroom community for Bay Area commuters, and is 100,000-plus people, is only four miles to the west, but none of their stuff talks about that potential audience.
To me, that suggests a part 15, which allows broadcasting on both AM and FM. If you see the yellow marker for the Banta Inn, at the center of the screen---the Facebook post says CowpokeRadio is across 7th Street, in this building, which actually fronts G Street:
View attachment 5067
So assuming that the server and transmitters are actually in there, here's the logical OTA (via Part 15) coverage map for Cowpoke Radio:
View attachment 5066
All that said, though...and I know Kelly will be here shortly to ask why the guy didn't just use a baby monitor and double his signal---I gotta respect this. The guy (who never identifies himself in his FB posts or on the website and whose ID is redacted from the whois search) created a whole fantasy thing that looks and feels like a rural California Country station from the early 60s, and he's kept it going for seven years.
Google Maps
Find local businesses, view maps and get driving directions in Google Maps.
I suspect this is the Antenna up the flag pole. If so, That doesn't look like part 15 antenna.

