Most of the people I've talked to aren't crazy alien conspiracy theorists so I can't really comment on that brand of conspiracy theorist. Honestly my main experience is the standard 9/11, global warming, and Obama conspiracy theories (which were incredibly racist) from the early to mid 2000s and those were all pretty similar to modern theories and at least for my father in law and his friends were definitely from Fox News and talk radio.

Edit: a good example to me was the start of the birther movement, which is a quinessential modern conspiracy theory to me, and I remember that as talk radio and Fox News.