The Stealth relocated to Everett, Washington, just north of Seattle after the 2009 season. They were formerly located in San Jose.
Pretty lousy name, especially for a sport like box lacrosse, where stealth is about as relevant as iambic pentameter is to haiku. Apparently the name is supposed to be some kind of homage to the Stealth Bomber.
On a personal note, my daughter's boyfriend was drafted by them, and played his rookie season in 2009. Whatever else the move does, in terms of fan support and attendance, it brings him a lot closer to home.