TweetStream locations?

Hello,

As I understand it, TweetStream has support for searching by locations.
However, I can’t seem to get it to work. Anyone see something wrong?

Here’s an example:

TweetStream::Client.new(‘twitterlogin’,
‘twitterpw’).sample.locations(’-122.75,36.8,-121.75,37.8’) do |status|
puts “[#{status.user.screen_name}] #{status.text}”
end

Thanks in advance.