There have been weekly opposition protests since December against what they describe as Vucic's slide towards autocratic rule, while accusing RTS of pandering to the ruling party and demanding more airtime for opposing views.
Earlier thousands marched peacefully through the centre of Belgrade as they have done on each Saturday since December 8.
Protests were also held in several other Serbian towns, with the marchers accusing those in power of muzzling the media and civil rights groups, also calling for the RTS chiefs to step down.
Vucic, an ultra-nationalist-turned-pro-European, has rejected claims he has become autocratic, and in return has launched a "Future of Serbia" campaign, visiting towns throughout Serbia and championing his policies.
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