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'To broadcast' is an irregular verb. Its forms are given here:

Base form past tense -ed participle Remarks
broadcast broadcast broadcast NEVER broadcasted
This is one of the "the 250 or so irregular verbs" listed in Quirk 1985. The list "contains most of the irregular verbs in present-day English ... but is not meant to be exhaustive, particularly with regard to derivative verbs." AWE has copied most of the entries in that list. The verb 'to broadcast' belongs to Quirk's Class 5 .
'To broadcast' is derived from Cast (irregular verb), on which you may want to click.
Apart from its most commonly used meaning in the twenty-first century ('to transmit by radio waves, etc'), the original meaning was 'to sow seed by scattering [casting] it from the hand in sweeps across the land [abroad]'. You may like to see Cast (meanings).