All five parties in the Stormont Executive will be allowed at least two party election broadcasts on commercial TV and radio in Northern Ireland for this year's General Election campaign.
However, Ofcom rejected a second broadcast for Traditional Unionist Voice in Northern Ireland.
The broadcasting watchdog said: "TUV did not demonstrate significant electoral support in the 2010 General Election in Northern Ireland. The party performed better in the 2014 European Parliamentary elections, obtaining 12.1% of the vote in Northern Ireland.
"However, it has not received significant support in other forms of election and nor does this party have significant current support in opinion polls."
Ukip has been guaranteed a minimum of two broadcasts in England and Wales in recognition of the surge in its popularity since 2010. However, it does not apply to Northern Ireland, where Ukip only has one MLA.
The same arrangement applies to the Conservatives, who also contest elections here but have little electoral support.
The Greens were also denied an extra broadcast. They will get one in England and Wales, but none in Northern Ireland.