Using Yahoo local search query for iPhone

Question

I'm using yahoo local search in an iPhone app and trying to query everything in a certain location. According to the api docs you can pass "*" to query and it will return everything. I've tried passing it several different ways, including the way below but it does not work unless I actually pass it a real query. Does anyone know how or what I need to pass to make it query everything?

[self setQuery:[@"*" stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]];

Thanks