They could kill people off, or they could use fear, intimidation, or bribery to get them to transmit material favorable to the regime. To co-opt such for their own uses makes sense in the resource poor post apocalyptic future.
Have the radio station "lose" a favorite announcer to a tragic and sudden illness. The radio can then run ads for the Uni, explaining all their great work.
There is more role play in the dirty tricks and underhanded dealing then the just combat driven blow up or take over the station scenarios.
Depends upon the age and play style of your group though. Younger players are going to want shoot'em up action driven games with lots of NPCs to mow down.
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