He has participated in and contributed to several television and radio shows, including XL and XLTV (1998–99), Nissene på låven (2001), Uti vår hage (2003), Team Antonsen (2004), Tre brødre som ikke er brødre (2005), Etaten (2006), Uti vår hage 2 (2008), Dag (2010–11), and Nissene over skog og hei (2011). He has also appeared in feature films, including starring roles in the animated feature Kurt blir grusom (Kurt Turns Evil, 2008) and the comedy Kong Curling (Curling King, 2011).
Antonsen has cooperated with such comedians as Harald Eia, Bård Tufte Johansen, Espen Thoresen Hværsaagod-Takkskalduha, Kristopher Schau and Johan Golden. Atle Antonsen and Johan Golden currently host a weekly radio show called "Misjonen" ("The Mission") on Fridays on Norwegian national radio station P4. The show first aired in August 2008, and was a continuation of their previous radio show "Kommisjonen" ("The Commission") which aired on now-defunct radio station Kanal 24.
On 1 September 2007, at the Norwegian Comedy Awards, Antonsen was awarded the Male Comedian of the Year. He started his speech by saying that the last time he won an award, his mother told him that he didn't thank people properly, and that he was going to do better this time. He paused for a couple of seconds before shouting out "Damnit! (Faen!) Didn't work this time either."
In 2012 he starred as King Arthur in the highly successful Norwegian staging of Spamalot, at Folketeatret in Oslo.
Atle has a near relationship to his grandfather Erik Meneilly. He says he learned the base of his humor by telling him jokes.
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