MILAN — Silvio Berlusconi’s TV group Mediaset has set up a company in Ireland called Mediaset Ireland, specializing in the trade of TV rights.The new company will be fully controlled by Mediaset. Italy’s largest commercial TV group owns just one other company abroad trading in TV rights, the Malta based Intl. Media Services, but it recently began to reduce its activities. Mediaset, which owns Italy’s largest TV library and one of the largest in Europe, annually spends about 1 trillion lire ($580 million) on TV rights, mainly for U.S. product. At the end of 1996, the Milan based group founded Luxembourg’s Mediaset Investment unit to reorganize its international holdings which, according to Mediaset execs, are bound to grow in the near future.