UPDATE 2-Telecinco says Euro 2008 ad boost disappointed

(Adds background on Euro 2008)

By Robert Hetz and Sarah Morris

MADRID, July 1 (Reuters) - Spain's victory in the Euro 2008 soccer championship delivered record television viewing figures, but the competition's contribution to Spanish advertising revenue disappointed, a top TV executive said on Tuesday.

Spaniards watched a record amount of television in June as their team advanced towards the European title, an average of 226 minutes per person per day, according to data released on Tuesday by consultancy Barlovento.

However, the viewing boost was not enough to correct falling advertising revenues since May, Telecinco (TL5.MC) Chief Executive Giuseppe Tringali told a business forum in Madrid on Tuesday.

"In the (first) half, television (advertising) will have a negative trend," he said. "The Euro 2008 helped but not enough."

Telecinco rivals Cuatro and pay-TV station Digital+, both owned by Prisa (PRS.MC) unit Sogecable, owned exclusive Spanish rights to the tournament.

The outlook for the second half for advertising was also unclear, Tringali said. "Deals (with advertisers) are always being done later and visibility is becoming ever more difficult. Making a forecast about the end of the year is complicated."

However, Tringali said he was convinced Telecinco would continue to keep its position as the channel with the largest market share and would increase its share of a business which generates 3 billion euros ($4.73 billion) a year.