You have to be careful here, because of the 75ohm requirement for your radio. Lots of stores still sell brand new rabbit ear 75ohm antennas—though usually labeled for TV they also work with radio—but they typically have a single coax connector, whereas your radio uses two flat pronged spade connectors. You can buy coax-to-spade adapters for cheap, but the problem is that they are also transformers: they transform the 75ohm coax input into 300ohm dual spade output, not 75ohm output. You don't want to do that.
Those transformers work well on stereo tuners and receivers that have 300ohm connectors for FM; I use them myself on my stereos. But your radio takes 75ohm only, so you need to find rabbit ear antennas that aren't coax—they should have either the dual spade connectors or just a pair of wires. Really old TVs had those built in, and on many of them you could disconnect the antenna from connectors on the back panel and pull the whole thing out through the antenna hole near the top of the TV. If you can't find an old TV like that, then an alternative is to use an antenna like this that has a 75ohm-to-75ohm adapter from coax to twin wires. That's one of the few new antennas I've seen that can split like that.
Thanks for the suggestion.
So, it looks like I could use the "push button" adapter that it comes with: Amazon Link
No mono stereo options.
About the RCA's - I didn't know that! It's currently hooked up to a Chromecast audio, so that shouldn't matter in this case. But when I hook my turntable back up... I'll set it up properly!