I have very little IC experience with radios so what I am about to share are more general thoughts.
There seems to be a lot of potential for cool roleplay, plotting and scheming around the use of radios so I hesitate to offer specific examples.
If possible, I think there might be some value in working with power levels of radios and how those power levels affect the range at which they can SEND and RECEIVE.
For example a 2500 series might be able to SEND to all sectors within the dome. A 1000 series might be able to SEND to a single sector. A 1000 series could RECEIVE from a 2500 series in another sector (for example, 2500 on GOLD can SEND to 1000 on RED) but the 1000 on RED cannot respond to the 2500.
That would introduce some interesting dynamics around command and control. It would also make some of the lower power radios more interesting by themselves because they could be used to receive transmissions. Then paired with other similar powered radios, they can be used by small groups to communicate with each other.
I see radios being extremely useful in the Mix for what should be obvious reasons that we shouldn't talk about here on BgBB. Even the lowest powered, 1000 series radios.
In the future I would like to see rigging tied to radios and transmitting power. Not necessarily radios themselves, but using similar mechanics. Right now it seems like riggers do not have enough skin in the game. (My personal opinion here.) There's nothing to prevent a rigger from sitting in the safety of some corporate enclave and sending a drone or whatever down into a dangerous portion of the city. By using the idea of radio ranges, there would be situations where riggers might need to be closer to the areas they want to operate drones in.
To get really complex, there could be a system for jamming signals. For example, a 2500 series radio could have enough power to transmit over a 1000 series on the same frequency. This has already been somewhat coded into the game as far as I can tell via the mechanic to hold down the transmit button on radio base stations. There is even a compensating mechanic in there where the radio overheats, presumably to prevent this from being abused.
I agree with 0x1mm that there do seem to be too many different varieties of radios.
There should be one system for Earth to Space. UHF , VHF , whatever. This should be in place to limit the communication between the two sectors of the game.
There should be some sort of mid-band system to bridge the Badlands and the city. These should be somewhat restricted so that factions in the various different parts of the world can SEND messages out, but not maintain sustained back and forth, real time communications. (Basically the system I proposed above with different power levels of radio). Or perhaps the mid-band radios are in fixed locations where they are susceptible to eavesdropping, interruption, etc. I don't have enough experience with Badlands / City conflict and roleplay to understand what balance issues easy / free and unchecked communication might create.
Then there should be tactical radios that do away with the nonsense about vehicles being Faraday cages, etc. One type of radio that works within a single sector. A second type that works within the entire city (probably vehicle mounted or stationary in a building). Then that's it. Let the people who want to use the radios figure out how to secure them and not broadcast their business to anyone who wants to listen in on it.
The price point of radios versus Progia's seems well balanced.