New York—Advanstar Communications Thursday reported healthy increases in revenue and EBITDA (earnings before interest, taxes, depreciation and amortization) for the first half of the year. Revenue increased 13% to $165.8 million, from $146.5 million in the first half of 2005. EBITDA rose 28% to $48.4 million, from $37.8 million in the year-earlier period. For the second quarter, revenue increased 6% to $59.2 million, from $56.0 million a year earlier. EBITDA rose 47% to $9.1 million, from $6.2 million a year earlier.