Naming Baltimore's football stadium in honor of the late John Unitas would be costly to the Ravens, but a handful of other teams have found a way to make similar gestures.

Since the death of Unitas on Wednesday of a heart attack, many fans have suggested renaming Ravens Stadium for him. An online petition asking that the building be renamed Johnny Unitas Memorial Stadium has attracted more than 47,000 signatures.

The death of the former Colts quarterback prompted an outpouring of tributes. A memorial service at 9:15 a.m. will precede a funeral Mass at 10 a.m. today at the Cathedral of Mary Our Queen, 5200 N. Charles St. Cardinal William H. Keeler will officiate at the Mass. Both services are open to the public.

The team's owners declined to discuss the stadium's name, saying it is too soon after Unitas' death. "We just don't want to discuss it right now," Ravens spokesman Kevin Byrne said yesterday. The Ravens have said they need revenue from a naming sponsor to field a competitive team.

Selling the name of a stadium to a corporate sponsor has become commonplace in sports. Deals can attract upward of $5 million a year.

But a few teams have avoided commercialization and experts say the Ravens - whose previous naming rights sponsor, PSINet Inc., went bankrupt - could do the same.

When Cincinnati Bengals owner Mike Brown obtained the rights to name his team's new stadium, he opted to honor his father, the founder of the franchise.The team has played in Paul Brown Stadium since it opened in 2000.

"Naming rights were explored but it was the strong sentiment of our owner that unless there was something that was too good to believe he preferred not to go the corporate naming route," said Bengals spokesman Jack Brennan.

The rights were valued at $16.7 million in the team's 30-year lease. Its terms required a percentage of that value to be paid to Hamilton County. The Bengals paid $5 million to the county and waived the potential income, according to The Dayton Daily News.

So far the lost revenue hasn't hampered the team's finances, Brennan said. "Every team pays about the same for players with the salary cap," he said.

"There are so many inputs and outputs that go into forming the budget of our team, they just worked it into the budget and whatever it cost us was, in the opinion of management here, worth it," he said.

The names of a few other new facilities remain ad-free. Officials considered but rejected seeking a corporate sponsor for the rebuilt Georgia Dome. In Oregon, the Rose Garden is named for the region's bountiful foliage, while the arena's gates, or "totems," carry the name of paying sponsors.

After criticism following the Sept. 11 terrorist attacks, the Chicago Bears agreed not to jettison the name of Soldier Field. The building is undergoing a massive renovation.

The Cleveland Browns also have avoided commercializing their field's name. The team, an expansion franchise sold to banker Al Lerner after the original one relocated to Baltimore in 1995, obtained the right to sell the stadium's name in its lease. But Lerner opted not to, after fans objected. The team has played at Cleveland Browns Stadium since it opened in 1999.

"It is from our owner directly. He would prefer to keep the tradition of the community and the NFL," Browns spokesman Nathan Boudreaux said.

Instead, the team sold the names of the stadium's four tower-like gates. Fans enter and leave through the Cleveland Clinic Sports Health Gate, the National City Gate, Steris Gate or the First Energy Gate.

"The best public relations move the Ravens could make after going through the PSINet debacle is to follow the Cleveland Browns model," said Marc Ganis, a Chicago-based sports consultant.

He estimates that the Browns' "gate sponsorships" have paid half to two-thirds of what a full-fledged stadium naming deal would have paid.

Naming rights deals are difficult to value. Figures often include benefits to the sponsor beyond a name on the building. The PSINet deal, struck in 1999, was known as a "presenting sponsorship."