July 24 (SeeNews) - Wireless operator Tele2 Croatia widened its negative earnings before interest, tax, depreciation and amortisation (EBITDA) to 178 million Swedish crowns ($30 million/19 million euro) in the first half of 2008 from 171 million crowns a year earlier despite a rise in net sales and customer numbers, its Swedish parent company, wireless operator Tele2, said.