As I mentioned in my other post you could "worldize" -
record the audio coming through the actual sources
Even if you worldize, you first must replicate what the broadcaster does to the audio before you worldize to help sell it.
For radio you must use "steamroller" compression; that is eliminating almost all dynamic content. Set the compressor to about a 10:1 ratio (or more) and a very short attack & decay, perhaps 6ms down to 2ms. This is applied to all "program" material. For the DJ voice you need to use a med or large diaphragm mic and record the voice very close to obtain the proximity effect, that overemphasized low end that cannot be gotten by just adding low-end EQ. The voice goes through a mild compressor and a hard ceiling limiter and, depending upon the voice, may need an EQ boost centered around 4kHz for "cut", especially when speaking over music. A short reverb that is barely audible when the compressor is disengaged will pop out when the compressor is engaged. You have to be careful here, too much 'verb can sound really corny - unless that's what you want a la 60's AM radio.
For TV you need about a 4:1 compression ratio and a decay of about 5ms to 12ms. TV news voices will be very dry and recorded with a lav; if you use a lav roll-off a little low end and add a little high end EQ. Program material is mixed and processed with - well, too much to go into; you wouldn't be asking the questions you're asking.
Car stereos will be a little compressed, have an exaggerated stereo spread, and the EQ is "crisp" and "boomy" with an upper mids EQ boost. You need a very tight close reverb to simulate the car interior.
TVs will have limited low end (hi-pass roll off around 100Hz to 120 Hz), high end will roll off at about 10kHz or 12kHz, exaggerated mids at about 6kHz and a very narrow stereo spread, almost mono (and most program material is mono anyway). Pick an appropriate room 'verb.
The average boom box lacks low end and has exaggerated low-mids and high end. Pick an appropriate reverb.
Home stereos are too varied, so not much EQ is needed, and it's mostly the type of room reverb you use that will sell it anyway.
It is a three stage process.
1. The broadcast material must be processed to sound like it came from that source - radio or TV.
2. You need to duplicate the playback medium - car/home stereo, boom-box, radio.
3. you need to duplicate the playback space - car, bedroom, kitchen, living room, out doors, etc.
When you worldize steps 2 & 3 are combined.
Have some fun and experiment, however; even if you don't keep the results you'll have learned something.