The experiment (one of them, that I'm aware of) that cements wave-particle duality is that you can dial the energy of an emitter down until it's emitting one photon at a time and still detect interference in a double-slit experiment. This is impossible if the photons and waves are distinguishable phenomena.
Radio waves are photons; photons are quantum entities that have particle- and wavelike behavior simultaneously.
Maybe check Wikipedia? Because it refutes you in the first sentence on the articles for "radio", "photon", and "light". You're just being pedantic about word definitions to play games with people.
Light beams (or similar sources of EM waves generated by individual electrons or nucleus) are made by photons. We can record individual photons.
Maybe, radio waves are made of photons, but nobody confirmed that yet, so I can safely say «no». If you can confirm that, Nobel prize is yours.
Are radio waves quantized? Of course, at Planck scale.
Is it possible to form a single 100kHz photon using a macro antenna? I hope for «yes», but I have no idea about «how».